Question 1 (3 points)

I have a 10-sided die. I roll it 50 times and count up the number of rolls for each side. I'm interested in whether or not this die was evenly weighted. The chi-square goodness of fit test would be appropriate to investigate this question.

Question 1 options:

	True
	False

Question 2 (3 points)

Listen

We have a sample of 400 jurors, each of which identifies as a particular racial group. We want to know if these are representative of a known population, based on percentages. Which should we run?

Question 2 options:

	Chi-square goodness of fit
	ANOVA
	t-test
	Chi-square test of independence

Question 3 (3 points)

Listen

Chi-square goodness of fit tests utilize two or more categorical variables

Question 3 options:

	True
	False

Question 4 (3 points)

Listen

We have two categorical variables and are interested in whether or not there is an association between them. We would use which test?

Question 4 options:

	Chi-square goodness of fit
	Chi-square test of independence
	None of these
	ANOVA

Question 5 (3 points)

Listen

Degrees of freedom for a chi-square test of independence is equal to which of the following?

Question 5 options:

	{"version":"1.1","math":"$(\#rows - 1) * (\#columns -1)$"}
	{"version":"1.1","math":"$(\#columns * \#rows) -1$"}
	{"version":"1.1","math":"$n_1+n_2-2$"}
	{"version":"1.1","math":"$n-1$"}

Question 6 (2 points)

Listen

If studying reading and writing scores of high school students, the average difference between the scores of all high school students could be referred to as the

Question 6 options:

	parameter of interest
	point estimate
	null parameter
	standard mean estimate

Question 7 (3 points)

Listen

Which of the following is true of t-distributions?

Question 7 options:

	It has thicker tails than the normal distribution
	It has thinner tails than the normal distribution
	None of these
	Unlike the normal distribution, it is not symmetrical

Question 8 (3 points)

Listen

If our sample size is _____, we often turn to the t-distribution

Question 8 options:

	unknown
	skewed
	small
	large

Question 9 (3 points)

Listen

The peak of the t-distribution is _____ compared to the normal distribution

Question 9 options:

	higher
	equal in size
	lower
	thicker

Question 10 (3 points)

Listen

In a t-distribution, observations are _____ likely to fall 2 standard deviations beyond the mean

Question 10 options:

	none of these
	equally
	less
	more

Question 11 (3 points)

Listen

As degrees of freedom increase, the t-distribution approximates the normal

Question 11 options:

	True
	False

Question 12 (3 points)

Listen

If you did multiple t-tests to see where group differences could be found, you would inflate

Question 12 options:

	Type I error
	Type II error
	Type III error
	Confidence intervals

Question 13 (3 points)

Listen

When doing multiple comparisons after an ANOVA, the Bonferroni correction adjusts alpha by doing what?

Question 13 options:

	Dividing by the square root of n
	Dividing alpha by the number of comparisons
	Increasing beta
	Decreasing degrees of freedom (df)

Question 14 (4 points)

Listen

Two t-test:

Test 1: Group A and B have mean difference = 10

Test 2: Group C and D have mean difference = 15

Test 1must be more significant than test 2

Question 14 options:

	True
	False

Question 15 (4 points)

Listen

t-test 1: mean difference = 12

t-test 2: mean difference = 20

t-test 2 could be nonsignificant while t-test 1 could be significant

Question 15 options:

	True
	False

Question 16 (4 points)

Listen

As sample size increases, t-tests are more likely to be....

Question 16 options:

	Nonsignificant
	Effective
	Significant
	It doesn't influence the statistic

Question 17 (3 points)

Listen

In ANOVA, if a p-value is lower than alpha, which of the following can we conclude?

Question 17 options:

	There is no significant difference between any two group means
	At least one pair of population means are different from each other (but we can't yet tell which one)
	The significant difference between group means is dependent upon the t-distribution
	At least one pair of population means are different from each other (and we can tell which one)

Question 18 (3 points)

Listen

Which of the following is true for the F and t-distributions?

Question 18 options:

	The t-distribution is used when you are uncertain of the F-distribution's parameters
	They are the same, except the t-distribution is one-tailed
	The F-distribution is one-tailed
	They are calculated the same way

Question 19 (3 points)

Listen

Degrees of freedom for ANOVA is the same as for independent samples t-test

Question 19 options:

	True
	False

Question 20 (3 points)

Listen

You are interested in determining if there is a mean difference between people from Canada, Zimbabwe, and Germany. Which of the following would be the best to run?

Question 20 options:

	confidence interval
	ANOVA
	t-test
	correlation

Question 21 (3 points)

Listen

You are interested in studying whether a diet helps people lose weight. You have a control and an experimental group, and want to know what test to run. You should use which of the following?

Question 21 options:

	Dependent (paired) samples t-test
	ANOVA
	Independent samples t-test
	Confidence interval