The data for this question are found in the sheet 1. These data represent final grades on a Neurobiology exam written on the last day of the final exam period.

A Calculate the 75% and the 95% confidence intervals around the mean of these grades.

a. 75% CI =[ , ]

b. 95% CI =[ , ]

B.It is known that when the exam is written on the first day of classes the average grade is ₀ = 54.093. A researcher wonders whether it makes a difference if the final exam is written on the first or last day of the exam period. Please, state H₀ and H₁in symbols.

a.H₀:

b.H_1:

3. Based on the confidence interval calculated in 1b, and assuming= .05, explain why we should retain or reject the null hypothesis.

4.Calculate the estimated effect size from the mean of this sample (m) and the population mean (₀), and calculate the approximate 95% confidence interval around this estimate.

a.Estimated effect size =

b.95% CI = [ , ]

Part B Data
49	88	92	50	75	70	89	82	61	69
30	33	42	71	67	42	69	19	73	65
69	61	58	92	85	44	63	60	45	45
76	100	49	65	47	41	71	61	39	52
56	98	52	100	72	82	37	53	39	55
46	97	70	84	69	53	38	54	68	60
48	40	69	44	63	44	74	44	64	57
52	65	98	20	22	76	49	78	62	65
34	34			51	53	70	41	52	42
55	39	70	66	91		43	73	48	61
35	54	80	59			44	100	44	61
	53	71	71	91		53	66	65	67
	56	35	34	65	66			53	66
	63	39	68	84	49			54	69
51	61	49	50	40	48			62	42
48	68	89	51	38	8	60	33	79	68
35	49	10	75	53	55	64	83	30	100
71	58	45	57	73	59	54	61	59	65
43	57	75	71	48	42	42			58
58	63	51	59	24	67	32			47
54	52	50	44	46	100	83			64
78	89	34	38	64	32	62	64	77	29
58	42	64	30	55	64	59	65	44	59
22	66	50	38	37	41	60	72	47	51