Question

A police officer is concerned about speeds on a certain section of Interstate 95. The data...

A police officer is concerned about speeds on a certain section of Interstate 95. The data accompanying this exercise show the speeds of 40 cars on a Saturday afternoon.

Highway speeds

65
60
63
68
66
70
70
68
69
65
61
68
61
67
65
61
69
70
67
65
60
69
70
68
61
60
66
64
65
68
61
62
62
60
69
62
62
62
69
62

a. The speed limit on this portion of Interstate 95 is 66 mph. Specify the competing hypotheses in order to determine if the average speed is greater than the speed limit.

1)H0: μ = 66; HA: μ ≠ 66

2)H0: μ ≥ 66; HA: μ < 66

3)H0: μ ≤ 66; HA: μ > 66

b-1. Calculate the value of the test statistic. (Round your answer to 3 decimal places.)

b-2. Find the p-value. Pick correct answer

1)0.05  p-value < 0.10

2)p-value  0.10

3)p-value < 0.01

4)0.01  p-value < 0.020

5)0.020 p-value < 0.05

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