PSTAT EXAM 4 UPDATED ACTUAL
Exam Questions and CORRECT Answers
student's t test for correlated groups really reduces to - CORRECT ANSWER - Student's t
test for single samples using difference scores
As N gets infinitely large, the critical value of t equals the critical value of z. - CORRECT
ANSWER - true
In the t test for independent groups, the unbiased estimate of the population variance is -
CORRECT ANSWER - a weighted average of s1^2 and s2^2
As df moves away from infinity, the t distribution - CORRECT ANSWER - flattens
Which of these values is NOT known when performing the single sample t-test? - CORRECT
ANSWER - Sample standard deviation
Population mean
Sample size
The df for the single sample t is equal to - CORRECT ANSWER - n-1
The 99% confidence interval will be _______ the 95% confidence interval - CORRECT
ANSWER - wider than
Which is NOT true of the sampling distribution of t? - CORRECT ANSWER - It is
identical to the z distribution
With other factors held constant, as the sample size decreases, the width of the confidence
interval will - CORRECT ANSWER - increase
, Properties of the t distribution? - CORRECT ANSWER - it is a family of many curves that
varies with degrees of freedom
it is symmetrical
it has a mean of 0
The independent group design involves analysis of the ______ scores and the repeated
measures design involves analysis of the ______ scores - CORRECT ANSWER - raw;
difference
true when using the t-test for correlated groups - CORRECT ANSWER - The t-test uses
information on the direction of the difference scores
The t-test uses information on the magnitude difference scores
The t-test will be more powerful than the sign test
In the t-test for independent samples, there are _____ degrees of freedom - CORRECT
ANSWER - n1+n2-2
When conducting a t-test for independent groups, an appropriate non-directional alternative
hypothesis would assert that the sample mean difference is due to sampling from a population
where - CORRECT ANSWER - µ1≠ µ2
Which is NOT true regarding assumptions for use of the independent groups t-test? - CORRECT
ANSWER - homoscedasticity is assumed
In a correlated groups design, the null hypothesis would state that the mean of the sample
difference scores are from a population of differences scores where - CORRECT
ANSWER - µD= 0
What is NOT TRUE about the sampling distribution of F? - CORRECT ANSWER - There
are negative values
Exam Questions and CORRECT Answers
student's t test for correlated groups really reduces to - CORRECT ANSWER - Student's t
test for single samples using difference scores
As N gets infinitely large, the critical value of t equals the critical value of z. - CORRECT
ANSWER - true
In the t test for independent groups, the unbiased estimate of the population variance is -
CORRECT ANSWER - a weighted average of s1^2 and s2^2
As df moves away from infinity, the t distribution - CORRECT ANSWER - flattens
Which of these values is NOT known when performing the single sample t-test? - CORRECT
ANSWER - Sample standard deviation
Population mean
Sample size
The df for the single sample t is equal to - CORRECT ANSWER - n-1
The 99% confidence interval will be _______ the 95% confidence interval - CORRECT
ANSWER - wider than
Which is NOT true of the sampling distribution of t? - CORRECT ANSWER - It is
identical to the z distribution
With other factors held constant, as the sample size decreases, the width of the confidence
interval will - CORRECT ANSWER - increase
, Properties of the t distribution? - CORRECT ANSWER - it is a family of many curves that
varies with degrees of freedom
it is symmetrical
it has a mean of 0
The independent group design involves analysis of the ______ scores and the repeated
measures design involves analysis of the ______ scores - CORRECT ANSWER - raw;
difference
true when using the t-test for correlated groups - CORRECT ANSWER - The t-test uses
information on the direction of the difference scores
The t-test uses information on the magnitude difference scores
The t-test will be more powerful than the sign test
In the t-test for independent samples, there are _____ degrees of freedom - CORRECT
ANSWER - n1+n2-2
When conducting a t-test for independent groups, an appropriate non-directional alternative
hypothesis would assert that the sample mean difference is due to sampling from a population
where - CORRECT ANSWER - µ1≠ µ2
Which is NOT true regarding assumptions for use of the independent groups t-test? - CORRECT
ANSWER - homoscedasticity is assumed
In a correlated groups design, the null hypothesis would state that the mean of the sample
difference scores are from a population of differences scores where - CORRECT
ANSWER - µD= 0
What is NOT TRUE about the sampling distribution of F? - CORRECT ANSWER - There
are negative values
