Question

Question
Dr. Gamble had been teaching PSYC 2021 for years, and always wore a suit to class. His average teaching evaluation across all courses and years was 4.2/5. As Dr. Gamble was preparing for an upcoming PSYC 2021 course (N = 132), he wondered whether his course evaluations would be lower than the average across all of his previous classes if he wore jeans and a t-shirt to every class in the upcoming term. Use null hypothesis testing (all steps) to determine if wearing jeans and a t-shirt will lower Dr. Gamble’s teaching evaluations, relative to the mean of all previous sections of the course. Note that only 59 of the 132 students completed a teaching evaluation. Be sure to appropriately interpret the confidence interval and effect size (even if it is subjective) and include a general summary of the results. Use α = .10. Show excel formula used.

Data Set:

ID	EVALS
1	3
2	4
3	4
4	5
5	5
6	5
7	3
8	5
9	5
10	4
11	4
12	3
13	4
14	5
15	3
16	5
17	5
18	5
19	5
20	3
21	4
22	2
23	4
24	3
25	3
26	4
27	4
28	4
29	5
30	3
31	5
32	3
33	5
34	3
35	4
36	5
37	5
38	5
39	3
40	5
41	4
42	2
43	5
44	5
45	4
46	5
47	4
48	5
49	2
50	5
51	3
52	5
53	3
54	2
55	3
56	4
57	5
58	4
59	3

Answer 1

Here test is left tailed with hypotheses as follows:

First we need to find the mean and SD using excel formula "=average()" and standard deviation "=stdev()". The mean and SD is

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Confidence interval:

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Effect size:

It is small effect size.