# Statistics flashcards, diagrams and study guides

Discover popular Statistics study sets on Quizlet. Study Statistics topics like Hypothesis Testing. Learn what you need to get good grades in Statistics classes. Memorize important Statistics terms, definitions, formulas and concepts. Prepare for Statistics homework and exams with free online flashcards, diagrams, study guides and practice tests.

## Top 20 sets of about 245,440

#### Experimental Design Vocabulary

Attempt to contact every individual in the entire population.

A specific experimental condition applied to the units/subjects

Systematically favors certain outcomes

#### statistics-hypothesis testing

p-value and critical value

alternative hypothesis

a true null hypothesis is rejected

#### Chapter 9 - Fundamentals of Hypothesis Testing

the mean of the population is equal to 55 the population proportion is not less than .65

the mean of the population is greater than 55 the population proportion is less than .65

you don't reject a null hypothesis that is false

#### The uncertainty of estimates

Descriptive statistics determined from a sample are used to estimate parameters of the population. This is possible when all individuals in the population have an equal chance of being sampled and individuals are sampled independently.

To answer this question, we need to know something about how the sampling process might effect the estimates we make, using the sampling distribution of the estimate.

the probability distribution of all values for an estimate that we might obtain when we sample a population

#### Statistics and Data Management

25th percentile of a data set, Lower Quartile

50th percentile of a data set, the Median

75th percentiles of a data set, Upper Quartile

#### Psy201 Ch 8 INTRODUCTION TO HYPOTHESIS TESTING

. The null hypothesis would say that class size has no effect on student learning.

2. False. A larger alpha means that the boundaries for the critical region move closer to the center of the distribution.

3. The .02 would be split between the two tails, with .01 in each tail. The z-score boundaries would be z = +2.33 and z = —2.33

#### Stat 104

True

True

False

#### Hypothesis Testing

The null hypothesis, denoted by H0, is usually the hypothesis that sample observations result purely from chance.

The alternative hypothesis, denoted by H1 or Ha, is the hypothesis that sample observations are influenced by some non-random cause.

A Type I error occurs when the researcher rejects a null hypothesis when it is true. The probability of committing a Type I error is called the significance level. This probability is also called alpha, and is often denoted by α.

#### Chapter 7 Hypothesis Testing

d. Do not reject Ho at all common levels of alpha

d. A statement that will be accepted only if there is convincing sample evidence that it is true

c. reject Ho if alpha is 0.05

#### SOCI 3318: MIDTERM EXAM REVIEW

A CHARACTERISTIC THAT CHANGES FROM PERSON TO PERSON, ATTRIBUTES ABOUT INDIVIDUALS VARY FROM PERSON TO PERSON. WE EXAMINE VARIABLES TO DETERMINE WHETHER THEY ARE RELATED TO ONE ANOTHER OR NOT. EG. GENDER - INCOME LEVEL - ATTITUDE ABOUT SEX EDUCATION IN PUBLIC SCHOOLS

THE LEVELS OF MEASUREMENT INCLUDE THE FOLLOWING: - NOMINAL - ORDINAL - CONTINUOUS

THE LEVEL OF MEASUREMENT IS IMPORTANT TO RECOGNIZE IN ORDER TO DETERMINE WHAT KIND OF STATISTICAL TEST TO PERFORM

#### Statistical Test - AQA Psychology RM

difference - unrelated OR association/correlation nominal

difference - unrelated ordinal

difference - related nominal

#### Stats Ch. 8 Intro to Hypothesis Testing

hypothesis testing

sample

A hypothesis test is a statistical method that uses sample data to evaluate a hypothesis about a population.

#### Statistical Reasoning Chapter 3 VOCAB

A chart representing data that shows the frequency that a statistic occurs on a number line, usually represented with marks above the number line for every occurrence of a simulation or data point occurring.

Experimentally determine the outcome of a study, through manipulation of objects or using an online applet.

Represents the probability or the percentage likelihood of an event occurring through random chance.

#### Intro to Statistics

An inferential statistical method that uses the data from a sample to draw inferences about a population

The actual distance between a sample mean M and a population mean µ.

The average distance between a sample mean M and the population mean µ that would be expected if H0 was true.

#### Statistics Vocabulary Chapter 1-3

The objects described by a set of data

The midpoint of a distribution of quantitative data

A _________ distribution describes the distribution of values of a categorical variable among individuals who have a specific value of another variable

#### Psyc 4012 Final Exam Study Questions

b) consumers, evaluators, and creators of science

e) All of the above

100 research studies, 61 not replicable, 15% generated completely different results Message of study: research methods are not static, but dynamic.

#### Basic Graphing & Statistics Quiz

the arithmetic average of a distribution, obtained by adding the scores and then dividing by the number of scores

A measure of variability that indicates the average difference between the scores and their mean.

the standard deviation of the sampling distribution of sample means

#### Stats hypothesis test

an inferential technique that uses the data from a sample to draw inferences about a population

states that the treatment has no effect

test statistic

#### Psych 215 - Part 2: Chapter 9: Confidence Intervals and Hypothesis Testing

Q: What is the probability if you pick a sample (say, of 4 people) at random from the population, that this sample's mean will be greater than 132? Before: p( x > 132 ) Now: p ( x̅ > 132 ) So, instead of the x guy, we're talking about the . . . x-men.

A: Instead of 1 person at a time, do 1 sample at a time. Sample 1 (4 students): x̅ = 110 Sample 2 (4 students): x̅ = 105 . . . . . . . . . .

A: Still bell-shaped and symmetric BUT . . . • Taller • Thinner Q: How much thinner? A: If the x distribution's sd were σ, then x̅. EX: σ/√N *NOTE: The new graph is called the "sampling distribution of means" (see pg. 170). p( x̅ > 132) = .003% OLD: z = x - μ / σ σ = 16, μ = 100, N = 4 *NEW: z = x̅ - μ / σ/√N Steps: 1) Draw picture 2) x → z 3) go to z table for %

#### statistics

any specific collection of objects of interest

any subset or subcollection of the population

the sample consists of the whole population