How can we help?

You can also find more resources in our Help Center.

Study sets matching "statistics chapter 7"

Study sets
Classes
Users

Study sets matching "statistics chapter 7"

28 terms
AP Statistics: Chapter 7
Discrete
R.V.
Random Variable
Discrete Random Variable
Countable
Random variable
A Variable whose value is a numerical outcome of a random phe…
X, is a random variable that has a countable number of possib…
Discrete
Countable
R.V.
Random variable
12 terms
Statistics: Chapter 7
sampling error
parameter
simple random sample
population mean
the difference between a measure computer from a sample (a st…
a measure computed from the entire population. As long as the…
a simple selected in such a manner that each possible sample…
sampling error
the difference between a measure computer from a sample (a st…
parameter
a measure computed from the entire population. As long as the…
20 terms
Statistics: Chapter 7
statistic
parameter
mean
variance
a numerical descriptive measure of a sample
a numerical descriptive measure of a population
statistic: x bar... parameter: mu
statistic: s^2... parameter: σ^2
statistic
a numerical descriptive measure of a sample
parameter
a numerical descriptive measure of a population
8 terms
Chapter 7 Statistics
Correlation Little Strength
Correlation Low Strength
Correlation Moderate Strength
Correlation High Strength
0.00-0.25
0.26-0.49
0.50-0.69
0.70-0.89
Correlation Little Strength
0.00-0.25
Correlation Low Strength
0.26-0.49
12 terms
Statistics: Chapter 7 vocab
Normal distribution
Empirical rule
Z score
Standard Normal
A continuous probability distribution. 1. Bell shaped curve,…
68%, 1 std dev, 95%, 2 std dev, 99.7%, 3 std dev
Gives the number of std dev between the original measurement…
Normal distribution with Mu= 0 and Sigma= 1
Normal distribution
A continuous probability distribution. 1. Bell shaped curve,…
Empirical rule
68%, 1 std dev, 95%, 2 std dev, 99.7%, 3 std dev
8 terms
Chapter 7 AP Statistics
Parameter
Statistics
Sampling Distribution
Unbiased Estimator
is a number that describes some characteristics of the popula…
is a number that describes some characteristics of the sample
is the distribution of values taken by the statistics in all…
a statistic used to estimate a parameter , if the mean of its…
Parameter
is a number that describes some characteristics of the popula…
Statistics
is a number that describes some characteristics of the sample
34 terms
AP Statistics Chapter 7
random variable
discrete
continuous
probability distribution of a discrete…
a numerical variable whose value is determined by the outcome…
can count, isolated points on number line
measured, includes entire interval on number line
gives the probability associated with each x value (formula,…
random variable
a numerical variable whose value is determined by the outcome…
discrete
can count, isolated points on number line
9 terms
Chapter 7 Statistics Review
Biased Sample
Unbiased Sample/Representative
Statistics
Voluntary Response Sample
is when one or more parts of the population are favored.
is when each item or person in the population is as likely to…
deals with collecting, organizing/analyzing, and interpreting…
involves only those who want to participate in the sampling.
Biased Sample
is when one or more parts of the population are favored.
Unbiased Sample/Representative
is when each item or person in the population is as likely to…
11 terms
Chapter 7 - Statistics and Correlation
data set
range
mean
median
all the data collected in a particular study
Distance between highest and lowest scores in a set of data.
the AVERAGE of a set of data; add them all up and divide the…
,Statistics: Mean, Median, Mode, Range, Graphing Data
data set
all the data collected in a particular study
range
Distance between highest and lowest scores in a set of data.
28 terms
AP Statistics: Chapter 7
Discrete
R.V.
Random Variable
Discrete Random Variable
Countable
Random variable
A Variable whose value is a numerical outcome of a random phe…
X, is a random variable that has a countable number of possib…
Discrete
Countable
R.V.
Random variable
22 terms
Business Statistics Chapter 7
statistical inference
parameter
statistic
biased, wording, leading, ambiguous, i…
To obtain information about a population from information con…
A numerical characteristic of a population
a numerical characteristic of a sample
Common sampling pitfalls are b______ samples, w________ of qu…
statistical inference
To obtain information about a population from information con…
parameter
A numerical characteristic of a population
31 terms
Chapter 7 Statistics
Perfect "r"
Correlation Little Strength
Correlation Low Strength
Correlation Moderate Strength
Strength/Direction, Larger the r value stronger correlation
0.00-0.25
0.26-0.49
0.50-0.69
Perfect "r"
Strength/Direction, Larger the r value stronger correlation
Correlation Little Strength
0.00-0.25
23 terms
Statistics Chapter 7
Addition Rule
Complement Rule
Conditional Probability
Disjoint Events
If A and B are disjoint events, the =n the probability of A o…
The probability of an event occurring is 1 minus the probabil…
P(B/A)= (P(A and B))/(P(A))... P(B/A) is read "the probability o…
Two events are disjoint if they have no outcomes in common. I…
Addition Rule
If A and B are disjoint events, the =n the probability of A o…
Complement Rule
The probability of an event occurring is 1 minus the probabil…
28 terms
Statistics Chapter 7
sampled population
frame
parameter
simple random sample
the population from which the sample is taken
a listing of the elements the sample will be selected from
a numerical characteristic of a population, such as a populat…
a blank of size n from a finite population of size N is a sam…
sampled population
the population from which the sample is taken
frame
a listing of the elements the sample will be selected from
10 terms
Statistics (Chapter 7)
Model
Normal Curve
Normally Distributed
Inflection Points
Anything that represents reality.
Bell shaped distribution.
A continuous random variable in which its relative frequency…
The point at which the normal curve changes direction.
Model
Anything that represents reality.
Normal Curve
Bell shaped distribution.
16 terms
AP Statistics Chapter 7 Vocabulary
Discrete
Continuous
Random Variable
Probability Distribution
A numerical variable that is countable
A numerical variable whose values can be any value on an inte…
A numerical variable with a value determined by the outcome o…
A formula, table, or graph that gives the probability of each…
Discrete
A numerical variable that is countable
Continuous
A numerical variable whose values can be any value on an inte…
Statistics Chapter 7
Population
Parameter
Census
Sample
a big group of people or objects we wish to study
a numerical property that summarizes a characteristic of the…
a survey where every member of the population is measured
a small group of people or objects taken from the population…
Population
a big group of people or objects we wish to study
Parameter
a numerical property that summarizes a characteristic of the…
8 terms
Statistics Chapter 7
Average
Central limit theorem
Exponential distribution
Mean
A number that describes the central tendency of the data
Given a random variable with known mean and known standard de…
A continuous random variable that appears when we are interes…
A number that measures the central tendency, aka average
Average
A number that describes the central tendency of the data
Central limit theorem
Given a random variable with known mean and known standard de…
11 terms
Statistics Chapter 7
Assumption
Parametric test
Nonparametric test
Robust hypothesis test
a characteristic that we ideally require the population from…
an inferential statistical analysis based on a set of assumpt…
an inferential statistical analysis that is not based on a se…
a test that produces fairly accurate results even when the da…
Assumption
a characteristic that we ideally require the population from…
Parametric test
an inferential statistical analysis based on a set of assumpt…
18 terms
Statistics Chapter 7
hypothesis test
null hypothesis
alternative hypothesis
type I error
process that uses sample statistics to test a claim about the…
statistical hypothesis that contains a statement of equality
complement of the null... - statement that must be true if Ho is…
occurs if the null hypothesis is rejected when it is true
hypothesis test
process that uses sample statistics to test a claim about the…
null hypothesis
statistical hypothesis that contains a statement of equality
13 terms
Chapter 7: Descriptive Statistics
Descriptive Statistics
Central Tendency
Mean
Median
Provides a calculation of central tendency and variation meas…
The center of a distribution: mean, median or mode.
A measure of center in a set of numerical data, computed by a…
A measure of center in a set of numerical data. The median of…
Descriptive Statistics
Provides a calculation of central tendency and variation meas…
Central Tendency
The center of a distribution: mean, median or mode.
30 terms
The Practice of Statistics - Chapter 7
Parameter
Statistic
Because good samples are chosen random…
We can describe the behavior of a samp…
A number that describes a character of the population. The va…
A number describing a characteristic of a sample. Statistics…
random variables.
What would happen if we did this many times?
Parameter
A number that describes a character of the population. The va…
Statistic
A number describing a characteristic of a sample. Statistics…
16 terms
Chapter 7 Statistics
Sampling Distribution of a statistic (…
Sampling Distribution shows...
Population distribution is the distrib…
An example of population distribution…
The probability distribution that specifies probabilities for…
All possible values of the sample proportion
take the sample
Population proportion p for a categorical variable (fixed)
Sampling Distribution of a statistic (…
The probability distribution that specifies probabilities for…
Sampling Distribution shows...
All possible values of the sample proportion
12 terms
Statistics Vocabulary - Chapter 7
household bias
nonresponse bias
quota sampling bias
response bias
when a sample includes only one member of any given household
make it hard to know which part of the population is underrep…
results when interviewers are given free choice in picking pe…
when the wording of the question changes the true answer
household bias
when a sample includes only one member of any given household
nonresponse bias
make it hard to know which part of the population is underrep…
Chapter 7 Statistics
Uniform Distribution
Properties of Continuous Distributions
Standard normal Distribution
Z-score
a constant function for all values of x for which the functio…
1. It's symmetric about it's mean, 𝜇.... 2. Because the mean, me…
u= 0 sd=1
x-u/sd
Uniform Distribution
a constant function for all values of x for which the functio…
Properties of Continuous Distributions
1. It's symmetric about it's mean, 𝜇.... 2. Because the mean, me…
6 terms
Statistics - Chapter 7
What is an independant variable?
What is a dependent variable?
What is the equation of the regression…
How do you find b for a regression line?
A variable set independently of the other variable
A variable set depending on the values of the independent var…
What is an independant variable?
A variable set independently of the other variable
What is a dependent variable?
A variable set depending on the values of the independent var…
10 terms
Chapter 7 Statistics Review
Sample
Population
Simple Random Sample
Survey
To save time and money, part of the large group, called a ___…
The large group being studied.
This is when each item or person in the population is as like…
This is a method of collecting information.
Sample
To save time and money, part of the large group, called a ___…
Population
The large group being studied.
10 terms
AP Statistics - Chapter 7
Random Variable
Discrete Random Variable
Probability Distribution
Density Curve
A variable whose value is a numerical outcome of a random phe…
Variable which has a countable number of possible values
Lists the values of the variables and their probabilities
Describes the probability distribution of a continuous random…
Random Variable
A variable whose value is a numerical outcome of a random phe…
Discrete Random Variable
Variable which has a countable number of possible values
32 terms
Chapter 7,8,9 Statistics
Scatterplots
Association
Outlier
Response Variable
Shows the relationship between 2 quantitative variable measur…
1) Direction: (slope tells direction) a positive direction me…
A point that does not fit the overall pattern seen in the sca…
What you are interested in, dependent, Y
Scatterplots
Shows the relationship between 2 quantitative variable measur…
Association
1) Direction: (slope tells direction) a positive direction me…
22 terms
Healthcare Statistics - Chapter 7
Adjusted hospital autopsy rate
Adjusted hospital autopsy rate Formula
Autopsy
Autopsy Rate
The proportion of hospital autopsies performed following the…
Total hospital autopsies X 100/Total # of deaths of hospital…
The postmortem examination of the organs and tissues of a bod…
The proportion or percentage of deaths in a healthcare organi…
Adjusted hospital autopsy rate
The proportion of hospital autopsies performed following the…
Adjusted hospital autopsy rate Formula
Total hospital autopsies X 100/Total # of deaths of hospital…
18 terms
Statistics Chapter 7
Line Equation
Line
Slope
+ Slope
Y=bX+a
This is defined by slope and intercept; defines a precise 1:1…
b; rate of change of a line
Increases Y
Line Equation
Y=bX+a
Line
This is defined by slope and intercept; defines a precise 1:1…
14 terms
Psychology Statistics Chapter 7
correlation
prediction
bivariate distribution
scatter diagram
a measure of the degree of relationship between two variables
when two variables are correlated, estimating the value of on…
a distribution that shows the relationship between two variab…
a graph of a bivariate distribution consisting of dots at the…
correlation
a measure of the degree of relationship between two variables
prediction
when two variables are correlated, estimating the value of on…
41 terms
Statistics Chapter 7&8
Inferential Statistics
Sampling
Random sampling
Types of Distributions
Social scientists want to know about the characteristics of a…
goal: obtain a subset of the population that represents the p…
-each element in the population has an equal chance at being…
1. Population... 2. Sample... 3.Sampling
Inferential Statistics
Social scientists want to know about the characteristics of a…
Sampling
goal: obtain a subset of the population that represents the p…
16 terms
AP Statistics Chapter 7
parameter
statistic
sampling distribution
unbiased estimator
a number that describes some characteristic of the population…
a number that describes some characteristic of a sample. This…
the distribution of values taken by the statistic in all poss…
statistic used to estimate a parameter is this if the mean of…
parameter
a number that describes some characteristic of the population…
statistic
a number that describes some characteristic of a sample. This…
25 terms
Healthcare Statistics - Chapter 7
autopsy
necropsy
postmortem examination
morgue
examination of a dead body to determine the cause of death; c…
another name for autopsy
another name for autopsy
normally the place in a hospital where autopsies are performed
autopsy
examination of a dead body to determine the cause of death; c…
necropsy
another name for autopsy
12 terms
AP Statistics Chapter 7
Mu
Theta
p
X bar
Population mean.
Population standard deviation.
Population proportion.
Sample mean.
Mu
Population mean.
Theta
Population standard deviation.
21 terms
Reg Statistics Ch 7 Vocab
Biased estimator
Central limit theorem (CLT)
Parameter
Population distribution
If the mean of its sampling distribution is not equal to the…
Says that when n is large, the sampling distribution of the s…
A number that describes some characteristic of the population
Gives the values of the variable for all the individuals in t…
Biased estimator
If the mean of its sampling distribution is not equal to the…
Central limit theorem (CLT)
Says that when n is large, the sampling distribution of the s…
16 terms
Applied Statistics Chapter 7
bias
selection bias
nonresponse bias
simple random sample
the tendency of a sample statistic to systematically overesti…
a systematic underrepresentation of certain groups from consi…
a systematic difference in preferences between respondents an…
A sample of n observations that has the same probability of b…
bias
the tendency of a sample statistic to systematically overesti…
selection bias
a systematic underrepresentation of certain groups from consi…
6 terms
Chapter 7 Essential of Statistics
Sampling error
Distribution of sample means
Sampling distribution
Expected value of M
Is the natural discrepancy, or modern era, between a sample s…
D_____ of s_____ m______ is the collection of sample means fo…
S______ d______ is a distribution of statistics obtained by s…
The mean of the distribution of sample means is equal to the…
Sampling error
Is the natural discrepancy, or modern era, between a sample s…
Distribution of sample means
D_____ of s_____ m______ is the collection of sample means fo…
28 terms
AP Statistics: Chapter 7
Probability distribution of X looks li…
Discrete
R.V.
Random Variable
Countable
Random variable
A Variable whose value is a numerical outcome of a random phe…
Probability distribution of X looks li…
Discrete
Countable
17 terms
Business Statistics: Chapter 7
Why should you sample?
Sampling Frame
Frames
Non-probability Sample
It is less time-consuming, less costly than selecting every i…
A listing of items that make up the population.
Data sources such as population lists, directories, or maps.
Items included are chosen without regard to their probability…
Why should you sample?
It is less time-consuming, less costly than selecting every i…
Sampling Frame
A listing of items that make up the population.
8 terms
Essentials of Statistics Chapter 7
Requirements for Using a Normal Distri…
Notation for Proportions
Point Estimate
Confidence interval.
1. The sample is a simple random sample.... 2. The conditions fo…
p = population proportion... p-hat = x/n sample proportion of x…
Is a single value (or point) used to approximate a population…
(or interval estimate) is a range (or an interval) of values…
Requirements for Using a Normal Distri…
1. The sample is a simple random sample.... 2. The conditions fo…
Notation for Proportions
p = population proportion... p-hat = x/n sample proportion of x…
5 terms
Statistics Chapter 7
A medium effect size (d) for a t test…
A t test for dependent means would be…
If an experimenter conducts a t test f…
The comparison distribution in a t tes…
.50
the level of reading comprehension of students at the beginni…
20 / 10 = 2.0
means of difference scores.
A medium effect size (d) for a t test…
.50
A t test for dependent means would be…
the level of reading comprehension of students at the beginni…
11 terms
Statistics - Chapter 7
sample proportion
point estimate
confidence interval
confidence level
the best point estimate of the population proportion ... (p-hat)
a single value used to approximate a population parameter
a range (or interval) of values used to estimate the true val…
is the probability (1 - alpha) that the cconfidence interval…
sample proportion
the best point estimate of the population proportion ... (p-hat)
point estimate
a single value used to approximate a population parameter
10 terms
Statistics Chapter 7
Predicted value
Residual
How to find residual
Quantitative Variables Conditions
estimate made from a model
difference between observed value and its associated predicte…
actual - predicted OR y-yhat=residual
quantitative variables only
Predicted value
estimate made from a model
Residual
difference between observed value and its associated predicte…
13 terms
Statistics Chapter 7
Hypothesis
Null Hypothesis
Alternative (Research) Hypothesis
Test Statistic
A statement about the numerical value of a population parameter
That which represents the status quo to the party performing…
That which will be accepted only if the data provide convinci…
A sample statistic computed from information provided in the…
Hypothesis
A statement about the numerical value of a population parameter
Null Hypothesis
That which represents the status quo to the party performing…
12 terms
Statistics Chapter 7 Vocabulary
model
linear model
predicted value
residuals
an equation or formula that simplifies and represents reality
an equation of a line. To interpret a linear model, we need t…
the value of (predicted y) found for a given x-value in the d…
the differences between data values and the corresponding val…
model
an equation or formula that simplifies and represents reality
linear model
an equation of a line. To interpret a linear model, we need t…
13 terms
Chapter 7 AP STATISTICS
Scatterplot
Lurking variable
What can create a cause and effect rel…
Shape
A graphical display used for 2 QUANTITATIVE VARIABLES
A variable that is related to both the explanatory variable a…
Only an experiment
Roughly linear
Scatterplot
A graphical display used for 2 QUANTITATIVE VARIABLES
Lurking variable
A variable that is related to both the explanatory variable a…
21 terms
Statistics chapter 7
Sampling error
error=
Sampling distribution
Important characteristics of sampling…
two samples are rarely identical
not a mistake
The collection of sample means for all the possible random sa…
1)sample mean always pile up around mean... 2)distributions of s…
Sampling error
two samples are rarely identical
error=
not a mistake
6 terms
Chapter 7 - Statistics
Statistical inference
Population
Sample
Estimates
The purpose of STATISTICAL INFERENCE is to obtain ... informatio…
A POPULATION is the set of all the elements of ... interest.
A SAMPLE is a subset of the population.
The sample results provide only ESTIMATES of ... the values of t…
Statistical inference
The purpose of STATISTICAL INFERENCE is to obtain ... informatio…
Population
A POPULATION is the set of all the elements of ... interest.
1 of 10