Question

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6. A statistics individual wants to assess whether her remedial job has been effective for her five students. She decides to conduct a related samples t-test and records the following grades for students prior to and after receiving her job.

Tutoring
Before	After
2.6	3.2
2.7	3.1
3.2	3.7
3.1	3.3
2.9	3.8

(A) Test whether or not her tutoring is effective at a 0.05 level of significance. State the value of the test statistic. (Round your answer to three decimal places.)
t = ___
(B) Compute effect size using estimated Cohen's d. (Round your answer to two decimal places.)
d = ___

7. A psychologist wants to know whether wives and husbands who both serve in a foreign war have similar levels of satisfaction in their marriage. To test this, six married couples currently serving in a foreign war were asked how satisfied they are with their spouse on a 7-point scale ranging from 1 (not satisfied at all) to 7 (very satisfied). The following are the responses from husband and wife pairs.

Married Couples
Wife	Husband
6	5
4	6
7	5
6	6
7	5
6	5

(A) Test whether or not mean ratings differ at a 0.05 level of significance. State the value of the test statistic. (Round your answer to three decimal places.) ___
(B) Compute effect size using eta-squared. (Round your answer to two decimal places.) ___

9. A researcher records the amount of time (in minutes) that parent-child pairs spent on social networking sites to test whether they show any generational differences. From the following findings reported in APA format, interpret these results. Parents spent significantly less time on social networking sites compared to their children (M_D = 42 minutes), t(19) = 3.476, p < 0.05, d = 0.59.

State the sample size.
___ participants

16. Listening to music has long been thought to enhance intelligence, especially during infancy and childhood. To test whether this is true, a researcher records the number of hours that eight high-performing students listened to music per day for 1 week. The data are listed in the table.

Music Listening Per Day (in hours)
4.3
4.9
4.9
3.8
4.2
5.4
4.2
4.5

(A) Find the confidence limits at a 95% CI for this one-independent sample. (Round your answers to two decimal places.)
___ to ___ hours per day

17. To save money, a local charity organization wants to target its mailing requests for donations to individuals who are most supportive of its cause. They ask a sample of 5 men and 5 women to rate the importance of their cause on a scale from 1 (not important at all) to 7 (very important). The ratings for men were M₁ = 6.3. The ratings for women were M₂ = 5.4. If the estimated standard error for the difference (s_{M1− M2}) is equal to 0.25, then consider the following.

(A) Find the confidence limits at an 80% CI for these two-independent samples. (Round your answers to two decimal places.)
___ to ___

18. An instructor believes that students do not retain as much information from a lecture on a Friday compared to a Monday. To test this belief, the instructor teaches a small sample of college students some preselected material from a single topic on statistics on a Friday and on a Monday. All students received a test on the material. The differences in scores for material taught on Friday minus Monday are listed in the following table.

Difference Scores (Friday − Monday)
−1.7
+1.0
+6.4
+3.5
+4.5

(A) Find the confidence limits at a 95% CI for these related samples. (Round your answers to two decimal places.)
___ to ___

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Answer 1

Answer 6) Here, we will do paired t-test. Hypothesis: How o Hi udo ud, is the difference between the after and before mooks of each student. Here, using right-tailed test Before (yi) After(xi) di :xi-Yi 3.2 0.6 0.0064 2.7 3.1 0.4 0.0144 3.2 3.7 0.5 0.0004 3.1 3.3 0.2 0.1027 2.9 3.8 0.9 0.1444 (di - 1) sum=2.6 0.268 2.615 = 0.52 ā= {din Eldi-a)? Sd = 0.268 -0.2588 Test Statistics Q) 0.52 = 4.4928 Sd.in 0.258815 Degree of freedom an-1=4 t-critical value for df = 4, 2=0.05, right- tailed test A critical = 2.132 (from table]

Desision: t=4.4972132 So, we defect soll bypothesis. b) Effect size: - al sd = 0.52 0-2588 Effect size=2.0098 Note: As Per HomeworkLib Policy anscaeged frost question. Remaining please repost the question Thank you