Question

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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. (You may find it useful to reference the appropriate table: z table or t table)

a. The speed limit on this portion of Interstate 95 is 63 mph. Specify the competing hypotheses in order to determine if the average speed is greater than the speed limit.

• H₀: μ = 63; H_A: μ ≠ 63

• H₀: μ ≥ 63; H_A: μ < 63

• H₀: μ ≤ 63; H_A: μ > 63

b-1. Calculate the value of the test statistic. (Round intermediate calculations to at least 4 decimal places and final answer to 3 decimal places.)

Answer 1