Question 15:

A pharmaceutical company is testing a new mood elevating drug.To evaluate the optimal dosage of the drug company researchers recruit 60 participants (guinea pigs) who are randomly assigned to one of six treatment levels (0 mg, 5mg, 10mg, 15mg, 20mg, and 25mg).The dependent variable in the study is a self-reported happiness scale that has a range of 1-25.Study results are presented in the following table.

0 mg 5 mg 10mg 15 mg 20 mg 25mg

7 5 2 20 16 16

5 8 10 11 8 12

1 4 5 7 11 6

4 8 7 10 3 4

3 2 13 15 16 5

8 7 10 8 11 8

2 4 13 11 9 9

1 2 2 9 9 19

9 8 9 19 24 6

1 4 5 7 11 6

Test the assumptions of the ANOVA using SPSS.

Test the assumption of normality. How many groups donothave normally distributed data (p<.05)?

Group of answer choices

0

1

2

3

4

Question 16

What is the conclusion of the assumption of homogeneity of variances (p<.05)?

Group of answer choices

A.All groups have equal variances.

B.All groups have different variances.

C.At least one group variance is different from the others.

Question 17

Based on the conclusions of the assumptions of normality and homogeneity of variances, what adjustments are needed?

Group of answer choices

A.Welch's adjustment is necessary.

B.The data should be transformed.

C.A non-parametric method should be used.

D.No adjustment is necessary.

Question 18

The first question of interest to the researcher is, is there a trend in the happiness level as the amount of the drug consumed increases?

What is the maximum number of trends that can be assessed?

Group of answer choices

A.1

B.5

C.6

D.7

Question 19

At what level of significance should the tests of each trend be performed in order to control the overall Type I Error rate to .05?

Group of answer choices

A..050

B..020

C..010

D..001

Question 20

Conduct a trend analysis using SPSS for the maximum number of trends.

Which is the correct form of the omnibusFstatistic?

Group of answer choices

A.F(5, 1)=5.604

B.F(5, 54)=5.604

C.F(1, 4)=18.345

D.F(1, 54)=18.346

Question 21

Which is the correct form of theFstatistic to test the cubic trend?

Group of answer choices

A.F(1, 2)=4.218

B.F(2, 1)=0.186

C.F(1, 54)=4.218

D.F(2, 54)=0.186

E.F(3, 54)=1.530

Question 22

Which trend would you choose to interpret?

Group of answer choices

A.Linear

B.Quadratic

C.Cubic

D.4^th-order

E.None of the above

Question 23

How are the total sums of squares of the data partitioned across trends?

Group of answer choices

A.The between groups sums of squares are equally divided among each of the trends.

B.The between groups sums of squares are equally divided among each of the trends and the deviations.

C.The sums of squares for each trend add up to the sums of squares between groups.

D.The sums of squares for each trend and their deviation add up to the sums of squares between groups.

Question 24

The second question of interest to the researcher is, does the drug have an effect on happiness, i.e. is the mean of the placebo group significantly different from the average of all other groups? Test this partial hypothesis using a single contrast.

What are the coefficients of the contrast? Selectallthat are true.

Group of answer choices

A.1, -1, -1, -1, -1, -1

B.5, -1, -1, -1, -1, -1

C.1, -5, -5, -5, -5, -5

D.5, -5, -5, -5, -5, -5

Question 25

Using SPSS, test the contrast. What is thettest statistic to test this contrast? Enter the value in the form #.###________________

Question 26

What is the conclusion to this question?

Group of answer choices

A.There is a significant effect of the drug on happiness.

B.There is not a significant effect of the drug on happiness.

C.The effect of the drug is significantly different for each dosage group.

D.The effect of the drug is the same at all levels of the dosage.

Question 27

The third question of interest to the researcher is, is there a significant difference in happiness for each group compared to the control group? Test these partial hypotheses using a family of contrasts.

What type of multiple comparisons test can be used to evaluate the set of contrasts?

Group of answer choices

A.Tukey's test

B.Dunnett's test

C.Dunnett T3 test

D.Games-Howell test

Question 28

Using SPSS, test the contrasts. What dosages of the drug resulted in a significantly different happiness level compared to the control group? Selectallthat apply.

Group of answer choices

A.5 mg

B.10 mg

C.15 mg

D.20 mg

E.25 mg

None of the dosages resulted in a significantly different level of happiness.

Question 29

How are the results based on the p-value (Sig.) related to the values reported in the confidence intervals?Select allthat are true.

Group of answer choices

A.Pairwise comparisons that are significantly different have a confidence interval that contains zero.

B.Pairwise comparisons that are significantly different have a confidence interval that does not contain zero.

C.Pairwise comparisons that are not significantly different have a confidence interval that contains zero.

D.Pairwise comparisons that are not significantly different have a confidence interval that does not contain zero.

E.The bounds of the confidence interval provide no information regarding the relationship between group means.

Question 30

If the researcher wanted to compare all groups to each other, what is the maximum number of pairwise comparisons?

Group of answer choices

A.5

B.6

C.15

D.50