5 The following is a simple random sample of vehicle speed on I-465 during the m

Question

5 The following is a simple random sample of vehicle speed on I-465 during the morning rush hour.
59 60 62 52 59 49 69 64 53
50 48 65 70 75 62 67 62 47
73 72 51 51 69 62 68 68 69
73 63 70 74 68 59 46 74 56
52 67 73 56 46 56 73 53 70
61 48 65 46 67 49 70 54 61
70 54 59 47 50 57 61 60 75
50 54 71 48 54 70 68 49 65
69 59 50 66 72 71 64 63 50
67 71 63 46 71 65 65 73 64
61 45 55 68 68 53 56 53 75
51 48 69 49 46 67 54 55 46
52 73 67 71 54 65 64 71 61
60 55 66 63 58 45 66 72 64
47 48 67 59 52 58 45 70 55
We are 95% confident that the mean speed of all vehicles during the morning rush hour is between _____ and _____ mph.

(Note: Use the Excel functions to compute the mean and standard deviation. Otherwise, you'd be wasting your time. And, don't round anything, except the final answer.)
a 54.1 56.3






b 57.2 59.8






c 59.0 62.0






d 60.2 63.4
















5 The following is a simple random sample of vehicle speed on I-465 during the morning rush hour.
59 60 62 52 59 49 69 64 53
50 48 65 70 75 62 67 62 47
73 72 51 51 69 62 68 68 69
73 63 70 74 68 59 46 74 56
52 67 73 56 46 56 73 53 70
61 48 65 46 67 49 70 54 61
70 54 59 47 50 57 61 60 75
50 54 71 48 54 70 68 49 65
69 59 50 66 72 71 64 63 50
67 71 63 46 71 65 65 73 64
61 45 55 68 68 53 56 53 75
51 48 69 49 46 67 54 55 46
52 73 67 71 54 65 64 71 61
60 55 66 63 58 45 66 72 64
47 48 67 59 52 58 45 70 55
We are 95% confident that the mean speed of all vehicles during the morning rush hour is between _____ and _____ mph.

(Note: Use the Excel functions to compute the mean and standard deviation. Otherwise, you'd be wasting your time. And, don't round anything, except the final answer.)
a 54.1 56.3






b 57.2 59.8






c 59.0 62.0






d 60.2 63.4

Explanation / Answer

mean = 60.47

sd dev = 8.85

mean lies = ( 60.47 + 1.96 * 8.85/sqrt(135) , 60.47 - 1.96 * 8.85/sqrt(135))

= (59, 62)

answer is C

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