My Research Methods class (N = 14) was interested in whether studying alone or in groups...

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My Research Methods class (N = 14) was interested in whetherstudying alone or in groups would result in better grades on theirthird exam. Half of the class (n = 7) studied for the exam alone,while the other half (n = 7) studied as a group. Their grades aresummarized in the below tables:
Â Â Â
Study Alone
Student
Grade
1
78%
2
97%
3
79%
4
90%
5
91%
6
74%
7
72%
Study in Group
Student
Grade
8 8
72%
9. 9
89%
1 10
77%
1 11
87%
1 12
89%
1 13
77%
1 14
69%
Using the above data, answer the following questions
Which type of t-test (one-sample, independent samples, relatedsamples) is appropriate for determining if those that that studiedin a group earned better or worse grades than those who studiedalone? Why?
State the alternative and null hypotheses (using thestatistical notation for stating mathematical relationships) thatrepresents the prediction that those who studied in a group willobtain grades that are, on average, different from that of thosewho studied alone.
Calculate pooled variance, standard error of the difference,and t_obt.
Using an alpha of 0.05, what is t_crit?Would you reject or fail to reject the null hypothesis? Why?

Answer & Explanation Solved by verified expert

4.3 Ratings (661 Votes)

independent samples test Ho 1 2 0 Ha 12 0 Level of Significance 005 Sample 1 study alone mean of sample 1 x1 083 standard deviation of sample 1 s1 See Answer

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Study Alone
Student	Grade
1	78%
2	97%
3	79%
4	90%
5	91%
6	74%
7	72%

Study in Group
Student	Grade
8 8	72%
9. 9	89%
1 10	77%
1 11	87%
1 12	89%
1 13	77%
1 14	69%