Part B: Hypothesis Testing and Confidence Intervals

Test each of the following two hypotheses using = 0.05. Week 1,4, and 5 spreadsheets can be used.

1. Mean sales per week exceed 42.5 per salesperson

2. Mean time per call is 14.7 minutes

• The data file is available under "Files". "Files" is located in the left main menu.Perform a hypothesis test for each hypothesis in order to see if there is evidence to support it. You can use either the p-value approach or the critical-values approach to draw conclusions. You need to explain your conclusion and interpret that to the claim in simple terms
• Compute a 99% confidence interval for the mean of each variable used in the above hypotheses and interpret the intervals.
• Report about the results, distilling down the results in a way that would be understandable to someone who does not know statistics. Clear explanations and interpretations are critical.
• All DeVry University policies are in effect.
• The report is due by the end of Week 6.
• Part B project is worth 100 total points. See grading rubric below.

Report Format:

1. All results. Include Excel screenshots of all results ORall formulas used.
2. Summary (about one paragraph on each of the two hypothesis tests)

SALES represents the number of sales made in one week.

CALLS represents the number of calls made in that week.

TIME represents the average time per call in that week.

YEARS represents years of experience the employee had in the call center. TYPE represents the type of training the employee received.

Sales (Y)	Calls (X1)	Time (X2)	Years (X3)	Type
37	117	14.8	0	GROUP
38	117	15.3	3	NONE
40	117	15.6	1	NONE
41	117	15.8	2	GROUP
37	120	18.2	2	GROUP
45	120	13.6	1	GROUP
43	131	16.8	4	GROUP
34	133	14.4	1	GROUP
37	133	15.2	2	GROUP
42	135	14.8	3	NONE
48	136	13.7	3	ONLINE
37	137	16.3	2	GROUP
39	138	15.5	1	NONE
45	138	19.3	4	GROUP
44	139	15.3	2	GROUP
45	140	13.6	1	GROUP
37	142	17.1	2	NONE
40	144	17.4	0	NONE
37	145	18	3	NONE
38	145	17.1	2	NONE
43	145	18.6	2	NONE
46	145	16.8	0	ONLINE
45	146	12	3	GROUP
37	148	15.7	3	GROUP
37	148	16.2	1	GROUP
42	148	16.9	1	NONE
43	148	15.9	1	ONLINE
43	148	14.5	4	ONLINE
44	148	13.5	3	GROUP
46	148	13.1	1	GROUP
39	149	18.8	1	GROUP
46	149	17.8	3	NONE
49	149	21.1	2	GROUP
40	150	10.8	1	GROUP
44	150	18.4	1	NONE
46	151	16	1	GROUP
37	152	19.8	0	GROUP
49	152	22.3	0	ONLINE
41	153	14.7	1	GROUP
42	153	15.5	2	GROUP
43	153	15.2	3	GROUP
46	153	14.1	1	ONLINE
42	154	14.8	2	ONLINE
41	155	13.6	3	GROUP
45	155	18.9	2	GROUP
39	156	13.3	4	NONE
48	156	15.1	4	ONLINE
41	157	11.5	3	ONLINE
47	157	14.3	1	GROUP
41	158	19.3	2	ONLINE
45	158	13.9	1	ONLINE
44	159	18.1	2	ONLINE
42	160	10.6	3	NONE
49	160	13.6	3	GROUP
49	161	16.1	3	NONE
46	162	16.2	2	ONLINE
46	162	12.1	1	GROUP
45	164	16.7	3	NONE
47	164	15.3	0	ONLINE
48	165	19.8	5	ONLINE
43	166	17.6	3	ONLINE
49	166	16.2	0	ONLINE
42	167	17.7	3	ONLINE
42	167	18	2	NONE
50	167	12.6	5	ONLINE
50	167	16.2	1	ONLINE
43	169	13.3	4	NONE
44	169	8.9	0	ONLINE
44	169	13.6	1	ONLINE
44	171	13.6	3	GROUP
48	171	13	2	GROUP
46	172	12.5	1	ONLINE
43	173	19.8	2	ONLINE
45	173	17.6	2	ONLINE
51	173	18.6	0	ONLINE
48	174	18.6	2	GROUP
57	174	10.8	2	NONE
48	175	13.7	1	ONLINE
47	176	14.1	2	ONLINE
45	177	14.2	2	GROUP
48	177	13.9	3	ONLINE
50	177	11.4	4	NONE
52	177	14.5	1	ONLINE
53	178	13.2	2	ONLINE
54	180	11.8	4	GROUP
44	182	15.5	4	NONE
53	182	10.5	1	ONLINE
47	183	12.8	2	ONLINE
49	184	16.7	2	ONLINE
50	184	15.6	2	ONLINE
53	184	15.2	0	ONLINE
45	185	13.3	1	ONLINE
44	188	12.9	3	GROUP
47	120	16.3	1	NONE
49	188	20.4	1	NONE
58	189	12	1	ONLINE
50	190	11.3	1	ONLINE
47	193	13.5	2	ONLINE
50	197	14	2	ONLINE
58	197	11.8	1	ONLINE