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Solution) Below are the durations (in minutes) of 40 time interval between eruptions of the geyser

Question: (15 points) Below are the durations (in minutes) of 40 time interval between eruptions of the geyser Old Faithful in Yellowstone National Park.

92	54	79	53	82	51	76	82	84	52
86	51	85	46	88	53	80	49	82	75
74	67	68	86	72	77	75	66	80	70
79	60	86	71	67	81	76	83	76	55

a) Manually (or with Excel) construct a normal probability plot for these data. Do they appear to come from an approximately normal distribution?

b) Run Minitab to verify your answer in part a).

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Solution) Below are the durations (in minutes) of 40 time interval between eruptions of the geyser

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92	54	79	53	82	51	76	82	84	52
86	51	85	46	88	53	80	49	82	75
74	67	68	86	72	77	75	66	80	70
79	60	86	71	67	81	76	83	76	55

92	54	79	53	82	51	76	82	84	52
86	51	85	46	88	53	80	49	82	75
74	67	68	86	72	77	75	66	80	70
79	60	86	71	67	81	76	83	76	55

92	54	79	53	82	51	76	82	84	52
86	51	85	46	88	53	80	49	82	75
74	67	68	86	72	77	75	66	80	70
79	60	86	71	67	81	76	83	76	55