Question

4. The effectiveness of an intervention program for teaching children about child abuse was examined by administering a 16-question test to children before and after participating in the program. As an example, the first question asked what would be the best thing to do if you saw someone shaking a baby. (The correct response was to tell the person to stop and tell another adult.) The change in percentage correct, post-test minus pre-test, was recorded for each question, and a test was carrier out to see if the results provide convincing evidence that the program was effective.

	N	Mean	StDev	SE Mean
Post	16	76.75	20.96	5.24
Pre	16	60.06	23.66	5.92
Diff	16	16.69	14.81	3.70

95% CI for mean difference: (8.79, 24.58)

T-Test of mean difference = 0 (vs not= 0): T-Value = XXX P-Value = 0.000

Was this a paired (select YES) or a two-sample independent (select NO) test?

a. Yes

b. No

5. Refer to question 4.

Would side-by-side boxplots provide the best display of this data?

a. Yes

b. No

6. Refer to question 4.

Does the null hypothesis state μ₁ - μ₂ = 0 (select YES) or μ_d = 0 (select NO)

a. Yes

b. No

7. Refer to question 4.

Find the t test statistic. Report to two decimal places.

8. Refer to questions 4-7.

Does the test suggest that the program significantly improved percentages correct on the various questions?

a. Yes

b. No

9. Refer to question 4.

Report the margin of error for the 95% confidence interval. (Report to two decimal places)

Answer 1