Question 1

Marks: 1

That null hypothesis for an ANOVA states

Choose one answer.

a. there will be a significant relationship between the groups.

b. I have no idea (do NOT pick this one even if it’s true)

c. there are no significant differences among the treatments.

d. at least one mean will be significantly different from the others.

Question 2

Marks: 1

A “treatment effect” refers to differences between scores that are caused by the different treatment conditions. These differences produced by “treatment effects” will contribute

Choose one answer.

a. to the numerator of the F-ratio.

b. to the denominator of the F-ratio.

c. to both the numerator and the denominator of the F-ratio.

d. “Treatment effects” do not contribute to the F-ratio because they are removed before the F-ratio is computed.

Question 3

Marks: 1

In analysis of variance, the term “factor” refers to

Choose one answer.

a. a dependent variable.

b. an independent variable.

c. a treatment mean.

d. a treatment total.

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Question 4

Marks: 1

The individual conditions or values that make up a factor are called

Choose one answer.

a. levels

b. within treatment variance

c. error term

d. independent variable

Question 5

Marks: 1

In analysis of variance, MS provides a measure of

Choose one answer.

a. variance.

b. z score

c. sum of scores

d. the post hoc test.

Question 6

Marks: 1

In analysis of variance, the F-ratio is a ratio of

Choose one answer.

a. two (or more) sample means.

b. two variances.

c. sample means divided by z-scores.

d. none of the above

Question 7

Marks: 1

A researcher reports an F-ratio with df = 3, 36 for an independent-measures ANOVA. How many individual subjects participated in the experiment?

Choose one answer.

a. 36

b. 39

c. 40

d. cannot be determined from the information given

Question 8

Marks: 1

A psychologist would like to investigate the effect that the color of a room has on a person’s mood. Ninety participants are separated into a red room (n = 30), a blue room (n = 30), and a green room (n = 30). How many levels are there?

Choose one answer.

a. 3

b. 2

c. 1

d. 90

Question 9

Marks: 1

A researcher reports an F-ratio with df = 3, 36 for an independent-measures ANOVA. How many treatment conditions were compared in this experiment?

Choose one answer.

a. 3

b. 4

c. 36

d. 39

Question 10

Marks: 1

For an experiment comparing more than two treatment conditions, you should use analysis of variance rather than separate t tests because

Choose one answer.

a. you are less likely to make a mistake in the computations of ANOVA.

b. you should never use an ANOVA with more than 2 groups.

c. ANOVA has less risk of a Type I Error.

d. ANOVA has less risk of a Type V Error.

Question 11

Marks: 1

The value for the within-treatments degrees of freedom, dfwithin, is determined by

Choose one answer.

a. n – 1.

b. N – 1.

c. k – 1.

d. N – k.

Question 12

Marks: 1

In general, the distribution of F-ratios is

Choose one answer.

a. a normal, symmetrical distribution with a mean of zero.

b. positively skewed with all values greater than or equal to zero.

c. negatively skewed with all values greater than or equal to zero.

d. what is a distribution? (even if this is true, do NOT pick this answer!)

Question 13

Marks: 1

An experiment compares two treatment conditions with a sample of n = 20 in each treatment. If the data are analyzed with ANOVA, the analysis would have dftotal =

Choose one answer.

a. 18.

b. 19.

c. 38.

d. 39.

Question 14

Marks: 1

The purpose of post hoc test is to

Choose one answer.

a. determine which treatments are significantly different.

b. determine how much difference there is between treatments.

c. determine whether or not a Type I Error was made in the ANOVA.

d. determine what your favorite tv show is!

Question 15

Marks: 1

Post hoc tests are necessary after an ANOVA whenever

Choose one answer.

a. H0 is rejected.

b. there are more than two treatments.

c. a and b

d. You always should do post hoc tests after an ANOVA.

Question 16

Marks: 1

For Treatment 1, n = 5, T = 5 and SS = 25. For Treatment 2, n = 5, T = 10 and SS = 20. For Treatment 3, n = 5, T = 15 and SS = 15. If the data were examined using an analysis of variance, the F-ratio would have df within equal to

Choose one answer.

a. 12.

b. 14.

c. 2

d. 3

Question 17

Marks: 1

For Treatment 1, n = 5, T = 5 and SS = 25. For Treatment 2, n = 5, T = 10 and SS = 20. For Treatment 3, n = 5, T = 15 and SS = 15. In the analysis of variance for these data, the between-treatments degrees of freedom is equal to

Choose one answer.

a. 2.

b. 3.

c. 12.

d. 14.

Question 18

Marks: 1

For Treatment 1, n = 5, T = 5 and SS = 25. For Treatment 2, n = 5, T = 10 and SS = 20. For Treatment 3, n = 5, T = 15 and SS = 15. In the analysis of variance for these data, SS within is equal to

Choose one answer.

a. 10.

b. 15.

c. 60.

d. cannot be determined from the information given

Question 19

Marks: 1

For an F-ratio with df = 2, 10, the critical value for a hypothesis test using alpha = .05 would be

Choose one answer.

a. 4.10.

b. 7.56.

c. 19.39.

d. 99.40.

Question 20

Marks: 1

A psychologist would like to examine the effects of a new drug on the activity level of animals. Three samples of rats are selected with n = 5 in each sample.The rats in the first sample serve as a control and do not get any of the drug.The rats in the second group receive a small dose, and the rats in the third group each get a large dose of the drug. The psychologist records the activity level for each animal. The data from this experiment are presented below. Do these data indicate any significant differences among the three groups? Test with alpha = .05. The no drug group has scores of 0, 2, 2, 0, and 1 with T = 5 and SS = 4. The small dose drug group has scores of 2, 2, 3, 2, and 1 with T =10 and SS = 2. The large dose drug group has scores of 5, 3, 2, 2, and 3 with T= 15 and SS = 6. Overall, G = 30 and total EX2 = 82. What is the value of the critical F ?

Choose one answer.

a. 6.59

b. 3.88

c. 3.29

d. 3.74

Question 21

Marks: 2

A psychologist would like to examine the effects of a new drug on the activity level of animals. Three samples of rats are selected with n = 5 in each sample. The rats in the first sample serve as a control and do not get any of the drug. The rats in the second group receive a small dose, and the rats in the third group each get a large dose of the drug. The psychologist records the activity level for each animal. The data from this experiment are presented below. Do these data indicate any significant differences among the three groups? Test with alpha = .05. The no drug group has scores of 0, 2, 2, 0, and 1 with T = 5 and SS = 4. The small dose drug group has scores of 2, 2, 3, 2, and 1 with T = 10 and SS = 2. The large dose drug group has scores of 5, 3, 2, 2, and 3 with T = 15 and SS = 6. Overall, G = 30 and total EX2 = 82. What is the value of F?

Choose one answer.

a. 22

b. 12

c. 10

d. 5

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Question 22

Marks: 1

A psychologist would like to examine the effects of a new drug on the activity level of animals. Three samples of rats are selected with n = 5 in each sample. The rats in the first sample serve as a control and do not get any of the drug. The rats in the second group receive a small dose, and the rats in the third group each get a large dose of the drug. The psychologist records the activity level for each animal. The data from this experiment are presented below. Do these data indicate any significant differences among the three groups? Test with alpha = .05. The no drug group has scores of 0, 2, 2, 0, and 1 with T = 5 and SS = 4. The small dose drug group has scores of 2, 2, 3, 2, and 1 with T = 10 and SS = 2. The large dose drug group has scores of 5, 3, 2, 2, and 3 with T = 15 and SS = 6. Overall, G = 30 and total EX2 = 82. What is the correct decision?

Choose one answer.

a. Fail to reject H0

b. Reject H0

Question 23

Marks: 1

A psychologist would like to examine the effects of a new drug on the activity level of animals. Three samples of rats are selected with n = 5 in each sample. The rats in the first sample serve as a control and do not get any of the drug. The rats in the second group receive a small dose, and the rats in the third group each get a large dose of the drug. The psychologist records the activity level for each animal. The data from this experiment are presented below. Do these data indicate any significant differences among the three groups? Test with alpha = .05. The no drug group has scores of 0, 2, 2, 0, and 1 with T = 5 and SS = 4. The small dose drug group has scores of 2, 2, 3, 2, and 1 with T = 10 and SS = 2. The large dose drug group has scores of 5, 3, 2, 2, and 3 with T = 15 and SS = 6. Overall, G = 30 and total EX2 = 82. What is the correct statistical notation of the results?

Choose one answer.

a. t(14) = 5, p < .05

b. t(2,12) = 5, p .05

d. t(14) = 5, p > .05

Question 24

Marks: 1

A psychologist would like to examine the effects of a new drug on the activity level of animals. Three samples of rats are selected with n = 5 in each sample. The rats in the first sample serve as a control and do not get any of the drug. The rats in the second group receive a small dose, and the rats in the third group each get a large dose of the drug. The psychologist records the activity level for each animal. The data from this experiment are presented below. Do these data indicate any significant differences among the three groups? Test with alpha = .05. The no drug group has scores of 0, 2, 2, 0, and 1 with T = 5 and SS = 4. The small dose drug group has scores of 2, 2, 3, 2, and 1 with T = 10 and SS = 2. The large dose drug group has scores of 5, 3, 2, 2, and 3 with T = 15 and SS = 6. If the post-hoc test reveals that the significant difference lies between the no drug group and the large dose group, what is the correct interpretation of the results?

Choose one answer.

a. The activity level of the no dose group was significantly greater than the large dose group.

b. There was not significant difference in activity level between the large dose group and the no dose group.

c. The activity level of the large dose group was significantly greater than the no dose group.

d. The activity level of the large dose group was significantly lower than the no dose group.

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