There is concern about the speed of automobiles traveling over a particular stretch of highway. For a random sample of 28 automobiles, radar indicated the following speeds in miles per hour. 59 63 68 57 55 72 58 69 52 55 60 67 51 59 53 64 58 57 66 61 65 70 64 65 57 56 61 59 a. Check for evidence of nonnormality. b. Find a point estimate of the population mean that is unbiased and efficient. c. Use an unbiased estimation procedure to find a point estimate of the variance of the sample mean.

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