PSTAT EXAM 4 QUESTIONS WITH CORRECT
ANSWERS
student's t test for correlated groups reduces to - 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. -
ANSWER true
In the t test for independent groups, the unbiased estimate of the population
variance is - ANSWER a weighted average of s1^2 and s2^2
As df moves away from infinity, the t distribution - ANSWER flattens
Which of these values is NOT known when performing the single sample t-test?
- ANSWER Sample standard deviation
Population mean
Sample size
The df for the single sample t is equal to - ANSWER n-1
The 99% confidence interval will be _______ the 95% confidence interval -
ANSWER wider than
Which is NOT true of the sampling distribution of t? - 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 - ANSWER increase
Properties of the t distribution? - 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 - ANSWER raw;
difference
true when using the t-test for correlated groups - 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 -
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 - ANSWER µ1≠ µ2
Which is NOT true regarding assumptions for use of the independent groups t-
test? - 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 -
ANSWER µD= 0
What is NOT TRUE about the sampling distribution of F? - ANSWER There
are negative values
It is negatively skewed
It is normal
What do you need to know about a population when conducting an F test? -
ANSWER Neither u nor o
The alternative hypothesis used in the ANOVA is - ANSWER always non-
directional
If Fobt is less than Fcrit, what would you decide? - ANSWER Retain the null
hypothesis
ANSWERS
student's t test for correlated groups reduces to - 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. -
ANSWER true
In the t test for independent groups, the unbiased estimate of the population
variance is - ANSWER a weighted average of s1^2 and s2^2
As df moves away from infinity, the t distribution - ANSWER flattens
Which of these values is NOT known when performing the single sample t-test?
- ANSWER Sample standard deviation
Population mean
Sample size
The df for the single sample t is equal to - ANSWER n-1
The 99% confidence interval will be _______ the 95% confidence interval -
ANSWER wider than
Which is NOT true of the sampling distribution of t? - 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 - ANSWER increase
Properties of the t distribution? - 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 - ANSWER raw;
difference
true when using the t-test for correlated groups - 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 -
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 - ANSWER µ1≠ µ2
Which is NOT true regarding assumptions for use of the independent groups t-
test? - 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 -
ANSWER µD= 0
What is NOT TRUE about the sampling distribution of F? - ANSWER There
are negative values
It is negatively skewed
It is normal
What do you need to know about a population when conducting an F test? -
ANSWER Neither u nor o
The alternative hypothesis used in the ANOVA is - ANSWER always non-
directional
If Fobt is less than Fcrit, what would you decide? - ANSWER Retain the null
hypothesis
