Question 1

You determine whether the probability of a statistic is less than .01 (p < .01) ______.

Accepted Answer

A)  when you do not reject the null hypothesis 
B)  when you reject the null hypothesis 
C)  whenever you analyze a set of data 
D)  when you accept the null hypothesis

Question 2

When you ______, this implies the probability of the statistic is ______.

Accepted Answer

A)  reject the null hypothesis; > .05 
B)  do not reject the null hypothesis; non-directional 
C)  reject the null hypothesis; low 
D)  do not reject the null hypothesis; < .05

Question 3

A researcher conducts a study measuring 10 people before and after they watch a movie and obtains a value of 2.85 for the t-statistic. For a non-directional alternative hypothesis, which of the following is the correct way to present this analysis?

Accepted Answer

A)  t(10) = 2.85, p < .05 
B)  t(9) = 2.85, p < .05 
C)  t(18) = 2.85, p < .05 
D)  t(20) = 2.85, p < .01

Question 4

A study compares the means of two groups, each having N = 10. If the standard deviations in the two groups are 3.00 and 5.00, what is the value for the standard error of the difference  ?

Accepted Answer

A)  .89 
B)  1.84 
C)  3.40 
D)  8.00

Question 5

A researcher collects data from a group of 21 people at Time 1 and Time 2. Assuming α = .05 (two-tailed), the critical value is ______.

Accepted Answer

A)  2.096 
B)  2.086 
C)  2.845 
D)  2.528

Question 6

In reporting the results of a statistical analysis in standard APA format, the letters "n.s." mean ______.

Accepted Answer

A)  "nonsignificant" 
B)  "not sure" 
C)  "non-statistical" 
D)  "not standard"

Question 7

For a sample of 12 participants, the t = 1.965 (α = .05; two-tailed), what would be the decision about the Null hypothesis

Accepted Answer

A)  The null hypothesis could neither be rejected nor accepted. 
B)  The null hypothesis would not be rejected. 
C)  The null hypothesis would be rejected. 
D)  The null hypothesis would need to be retested.

Question 8

If your value of a statistic like the t-test falls in the ______ area of this distribution, you will ______ the null hypothesis ______ because the probability of the statistic is ______.

Accepted Answer

A)  shaded; reject; low 
B)  shaded; not reject; high 
C)  unshaded; reject; low 
D)  unshaded; not reject; low

Question 9

You are ______ likely to reject the null hypothesis when the alternative hypothesis is ______.

Accepted Answer

A)  less; directional 
B)  equally; non-directional 
C)  more; non-directional 
D)  more; directional

Question 10

In testing the difference between two means, which of the following is implied by the alternative hypothesis (H1)?

Accepted Answer

A)  The two population means are equal to each other. 
B)  The difference between the two population means is equal to 0. 
C)  The difference between the two population means is not equal to 0. 
D)  The difference between the two sample means is equal to 0.

Question 11

A researcher states the following hypotheses: H0: μTime 1 = μTime 2 and H1: μTime 1 < μTime 2. Assuming she collects data from 15 people, what is the appropriate critical value (α = .05; one-tailed)?

Accepted Answer

A)  1.697 
B)  1.761 
C)  2.045 
D)  2.145

Question 12

A study compares the means of two groups, each having N = 11. If the standard deviations of the two groups are 5.00 and 3.00, what is the value for the standard error of the difference  ?

Accepted Answer

A)  .60 
B)  .85 
C)  1.76 
D)  3.09

Question 13

A ______ symbol is part of the ______ hypothesis, and implies this hypothesis is ______.

Accepted Answer

A)  >; alternative; one-tailed 
B)  ≠; null; directional 
C)  ≠; alternative; directional 
D)  ; null; non-directional

Question 14

What did the researcher do to cause the change in the shaded regions in the two distributions?  "Before"  "After"

Accepted Answer

A)  She changed alpha from .05 to .01. 
B)  She changed alpha from .05 to .10. 
C)  She changed from a directional to a non-directional alternative hypothesis. 
D)  She changed from a non-directional to a directional alternative hypothesis.

Question 15

When reporting the results of a t-statistic, the researcher should include the means of both groups.

Accepted Answer

A) True 
 B)False

Question 16

When the null hypothesis is ______, this typically means the research hypothesis is ______.

Accepted Answer

A)  not rejected; supported 
B)  rejected; supported 
C)  rejected; not supported 
D)  rejected; proven

Question 17

Bill and Bob conduct two separate studies. By an amazing coincidence, they obtain exactly the same sample means and standard deviations. However, Bill's sample is twice as large as Bob's. Which of these is true?

Accepted Answer

A)  Bill's critical values will be larger than Bob's. 
B)  Bill's degrees of freedom are smaller than Bob's. 
C)  Bill is more likely to reject the null hypothesis than Bob. 
D)  Bill's value of α will be smaller than Bob's.

Question 18

When the null hypothesis is ______, this typically means the research hypothesis is ______.

Accepted Answer

A)  not rejected; not supported 
B)  rejected; supported 
C)  rejected; not supported 
D)  rejected; proven

Question 19

In conducting the t-test for independent means, if you ______, the two means ______.

Accepted Answer

A)  reject the null hypothesis; are significantly different from each other 
B)  accept the null hypothesis; are significantly different from each other 
C)  do not reject the null hypothesis; are significantly equal to each other 
D)  reject the null hypothesis; are significantly equal to each other

Question 20

A researcher states the following hypotheses: H0: μ Freshmen = μ Sophomores and H1: μ Freshmen ≠ μ Sophomores. Assuming she collects data from 13 freshmen and 13 sophomores, what is the appropriate critical value?

Accepted Answer

A)  1.706 
B)  1.711 
C)  2.056 
D)  2.064

Exam 9: Testing the Difference Between Two Means

You determine whether the probability of a statistic is less than .01 (p < .01) ______.

When you , this implies the probability of the statistic is .

A researcher conducts a study measuring 10 people before and after they watch a movie and obtains a value of 2.85 for the t-statistic. For a non-directional alternative hypothesis, which of the following is the correct way to present this analysis?

A study compares the means of two groups, each having N = 10. If the standard deviations in the two groups are 3.00 and 5.00, what is the value for the standard error of the difference ?

A researcher collects data from a group of 21 people at Time 1 and Time 2. Assuming α = .05 (two-tailed) , the critical value is ______.

In reporting the results of a statistical analysis in standard APA format, the letters "n.s." mean ______.

For a sample of 12 participants, the t = 1.965 (α = .05; two-tailed) , what would be the decision about the Null hypothesis

If your value of a statistic like the t-test falls in the area of this distribution, you will the null hypothesis because the probability of the statistic is .

You are likely to reject the null hypothesis when the alternative hypothesis is .

In testing the difference between two means, which of the following is implied by the alternative hypothesis (H₁) ?

A researcher states the following hypotheses: H₀: μTime 1 = μTime 2 and H₁: μTime 1 < μTime 2. Assuming she collects data from 15 people, what is the appropriate critical value (α = .05; one-tailed) ?

A study compares the means of two groups, each having N = 11. If the standard deviations of the two groups are 5.00 and 3.00, what is the value for the standard error of the difference ?

A symbol is part of the hypothesis, and implies this hypothesis is __.

What did the researcher do to cause the change in the shaded regions in the two distributions? "Before" "After"

When reporting the results of a t-statistic, the researcher should include the means of both groups.

When the null hypothesis is , this typically means the research hypothesis is .

Bill and Bob conduct two separate studies. By an amazing coincidence, they obtain exactly the same sample means and standard deviations. However, Bill's sample is twice as large as Bob's. Which of these is true?

When the null hypothesis is , this typically means the research hypothesis is .

In conducting the t-test for independent means, if you , the two means .

A researcher states the following hypotheses: H₀: μ Freshmen = μ Sophomores and H₁: μ Freshmen ≠ μ Sophomores. Assuming she collects data from 13 freshmen and 13 sophomores, what is the appropriate critical value?

Exam 9: Testing the Difference Between Two Means

You determine whether the probability of a statistic is less than .01 (p < .01) ______.

When you ______, this implies the probability of the statistic is ______.

A researcher conducts a study measuring 10 people before and after they watch a movie and obtains a value of 2.85 for the t-statistic. For a non-directional alternative hypothesis, which of the following is the correct way to present this analysis?

A study compares the means of two groups, each having N = 10. If the standard deviations in the two groups are 3.00 and 5.00, what is the value for the standard error of the difference ?

A researcher collects data from a group of 21 people at Time 1 and Time 2. Assuming α = .05 (two-tailed) , the critical value is ______.

In reporting the results of a statistical analysis in standard APA format, the letters "n.s." mean ______.

For a sample of 12 participants, the t = 1.965 (α = .05; two-tailed) , what would be the decision about the Null hypothesis

If your value of a statistic like the t-test falls in the ______ area of this distribution, you will ______ the null hypothesis ______ because the probability of the statistic is ______.

You are ______ likely to reject the null hypothesis when the alternative hypothesis is ______.

In testing the difference between two means, which of the following is implied by the alternative hypothesis (H1) ?

A researcher states the following hypotheses: H0: μTime 1 = μTime 2 and H1: μTime 1 < μTime 2. Assuming she collects data from 15 people, what is the appropriate critical value (α = .05; one-tailed) ?

A study compares the means of two groups, each having N = 11. If the standard deviations of the two groups are 5.00 and 3.00, what is the value for the standard error of the difference ?

A ______ symbol is part of the ______ hypothesis, and implies this hypothesis is ______.

What did the researcher do to cause the change in the shaded regions in the two distributions? "Before" "After"

When reporting the results of a t-statistic, the researcher should include the means of both groups.

When the null hypothesis is ______, this typically means the research hypothesis is ______.

Bill and Bob conduct two separate studies. By an amazing coincidence, they obtain exactly the same sample means and standard deviations. However, Bill's sample is twice as large as Bob's. Which of these is true?

When the null hypothesis is ______, this typically means the research hypothesis is ______.

In conducting the t-test for independent means, if you ______, the two means ______.

A researcher states the following hypotheses: H0: μ Freshmen = μ Sophomores and H1: μ Freshmen ≠ μ Sophomores. Assuming she collects data from 13 freshmen and 13 sophomores, what is the appropriate critical value?

When you , this implies the probability of the statistic is .

If your value of a statistic like the t-test falls in the area of this distribution, you will the null hypothesis because the probability of the statistic is .

You are likely to reject the null hypothesis when the alternative hypothesis is .

In testing the difference between two means, which of the following is implied by the alternative hypothesis (H₁) ?

A researcher states the following hypotheses: H₀: μTime 1 = μTime 2 and H₁: μTime 1 < μTime 2. Assuming she collects data from 15 people, what is the appropriate critical value (α = .05; one-tailed) ?

A symbol is part of the hypothesis, and implies this hypothesis is __.

When the null hypothesis is , this typically means the research hypothesis is .

When the null hypothesis is , this typically means the research hypothesis is .

In conducting the t-test for independent means, if you , the two means .

A researcher states the following hypotheses: H₀: μ Freshmen = μ Sophomores and H₁: μ Freshmen ≠ μ Sophomores. Assuming she collects data from 13 freshmen and 13 sophomores, what is the appropriate critical value?