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Dual Statistics: College Exam Final Review
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Terms in this set (57)
What hypothesis variable do you use when it states there is a linear correlation?
Rho
What test do you use when rho is the variable?
LinRegTTest
What do you do when p<.05?
Reject null
What is the linear regression equation?
y = a + bx
When you reject the null, is it useful or useless?
Useful
What are the requirements for a good estimate?
Linear correlation is strong
# is within range of x values
What defines a strong correlation?
.7 - 1
When there is a weak r value, what value do you use?
Y bar
When do you say yes to the equation being a good estimate?
When # is within the range of x values
When do you say no to the equation being a good estimate?
When # is not within the range of x values
What can you conclude when the p<.05?
Response to question is dependent
What can we predict when probabilities are different enough?
There is a relationship
How do you find mean?
Sum/Total
How do you find median?
# in middle
Mean is best choice for quantitative data when?
There is NO outlier
Median is the best choice for quantitative data when?
There is AN outlier
Why do you use the median instead of the mean for a quantitative data set when there is an outlier?
Because the mean is more affected by the outlier
When a problem "two brands" and "reliability" what are you looking for?
Standard deviation
Does order MATTER or NOT?
Sample of 11 objects drawn from a population of 13 objects.
Order DOESNT matter
Does order MATTER or NOT?
Different ballots for P, VP, and T can be made if 11 people run.
Order MATTERS
How do you find class width?
L1: column 2 first # - column 1 first #
How do you find class midpoint?
Column 1+2/2
What is the formula for mean from the frequency distribution?
(f•midpoint)/f
What is the probability formula?
binompdf (n,p,x)
Do you want the probability small or large?
Small to increase profit
What is the mean formula for the binomial probability distribution?
n•p= mu
What is the standard deviation formula for the binomial probability distribution?
Square root of n(p)(q)
What is the minimum usual value formula?
mu-2(standard deviation)
What is the maximum usual value formula?
mu+2(standard deviation)
What defines unusual?
If # is not within usual range
If p value is small what does that indicate?
Probability is very high
If they score better in a z score test what does that indicate?
The z score is higher
What's the confidence interval for estimating the population proportion?
1PropZInt
What's another word for MOE?
Within
What critical value do you find when doing a proportion test?
invNorm
Where it the reject null region?
Left
Right
Where is the fail to reject null region?
Center
What test statistic do you find when doing a proportion test?
1PropZTest
What does it mean if the p<.05?
Reject null
Support claim
What does fail to reject indicate?
Not sufficient evidence
What critical value do you find when using mean?
T-chart
What test statistic do you find when using mean?
T-test
What critical value do you find when using standard deviation?
Chi ^2
What tests statistic do you find when using standard deviation?
Chi ^2
What does it mean when test statistic is less than CV?
Test statistic does not fall in rejection region
Fail to reject null
What test statistic do you find when two samples are independent?
2SampTTest
What does it mean when p>.05?
Fail to reject null
Cannot support claim
What does it mean when test statistic does not fall in the critical region?
Does not appear to be effect
What does fail to reject null indicate?
Not sufficient evidence
For a right tail test we reject null if what?
p<.05
What does a higher z score indicate?
Higher relative position
What make a an score unusual?
Less then -2.00 or greater than 2.00
REMEMBER 1 PROPZINT
...
When it says "vary" what do you use?
Standard deviation
If it is different what type of tailed test is it?
Two tailed
Null means what?
Independent
No relation
Alternative means what?
Dependent
Relation
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