Question 1

A Type I error is defined as ________.

Group of answer choices

a.rejecting a true null hypothesis

b. failing to reject a false null hypothesis

c. rejecting a false null hypothesis

d. failing to reject a true null hypothesis

Question 2

Based on the IQ scores for 19 of her children, Michelle Duggar performs a hypothesis test to see if her children (M IQ score = 120) are significantly ( = .01) more intelligent than the average person in the population at large ( IQ score = 100, = 15).

What is the correct null hypothesis for this test?

Group of answer choices

a. 100

b. = 100

c.

d. > 100

e. 100

f. 100

Question 3

Based on the IQ scores for 19 of her children, Michelle Duggar performs a hypothesis test to see if her children (M IQ score = 120) are significantly ( = .01) more intelligent than the average person in the population at large ( IQ score = 100, = 15).

What is the critical value for this test?

Group of answer choices

z crit. = 1.96

z crit. = 1.96

z crit. = -1.65

z crit. = 1.65

z crit. = -2.33

z crit. = 2.33

z crit. = -2.58

z crit. = 2.58

Question 4

Based on the IQ scores for 19 of her children, Michelle Duggar performs a hypothesis test to see if her children (M IQ score = 120) are significantly ( = .01) more intelligent than the average person in the population at large ( IQ score = 100, = 15).

What is the z-score for her sample and the most appropriate decision and conclusion for this hypothesis test?

Group of answer choices

z = 1.333; Reject the null hypothesis. Results suggest the Duggar children are significantly more intelligent than the population at large.

z = 1.333; Reject the null hypothesis. Results suggest the Duggar children are not significantly more intelligent than the population at large.

z= 1.333; Fail to reject the null hypothesis. Results suggest the Duggar children are significantly more intelligent than the population at large.

z = 1.333; Fail to reject the null hypothesis. Results suggest the Duggar children are not significantly more intelligent than the population at large.

z = 5.812; Reject the null hypothesis. Results suggest the Duggar children are significantly more intelligent than the population at large.

z = 5.812; Reject the null hypothesis. Results suggest the Duggar children are not significantly more intelligent than the population at large.

z = 5.812; Fail to reject the null hypothesis. Results suggest the Duggar children are significantly more intelligent than the population at large.

z = 5.812; Fail to reject the null hypothesis. Results suggest the Duggar children are not significantly more intelligent than the population at large.

Question 5

Based on the IQ scores for 19 of her children, Michelle Duggar performs a hypothesis test to see if her children (M IQ score = 120) are significantly ( = .01) more intelligent than the average person in the population at large ( IQ score = 100, = 15).

What is the effect size for the effect of being a Duggar on IQ?

Group of answer choices

d = 1.333

d = 20

d = 0.750

d = 2.906

Question 6

In hypothesis tests, standard error measures ________.

Group of answer choices

the amount of difference between M and that is reasonable to expect if the null hypothesis is true

the size of the treatment effect

the size of the critical region

variability among population means

Question 7

Which combination of factors will decrease the chances of rejecting the null hypothesis?

Group of answer choices

a large standard error and a large alpha level

a large standard error and a small alpha level

a small standard error and a large alpha level

a small standard error and a small alpha level

Question 8

Danette is studying employees and examining the relationship between sociopathic tendencies and position within the organization (e.g., entry level, management, executive). She hypothesizes that individuals with higher status jobs will also display moresociopathic tendencies. Due to the nature of her survey questions, many people who start the survey never finish it because they are offended. Her final sample size is only n = 20 and she finds no significant relationship even though she knows one exists. Danette is probably convinced that_________ explains her non-significant findings.

Group of answer choices

Sampling Error

Type I Error

Type II Error

The Standard Error