Refer to Exercise 6.64.
In exercise

The small number of vehicles in the study has led to criticism of the results. A new study is to be conducted with a larger sample size. Assume that both populations of damages are normally distributed with a common σ = $ 700.
a. Determine the sample size that allows us to be 95% confident that the estimate of the difference in mean repair costs is within $ 500 of the true difference.
b. For the research hypothesis Ha: μSUV > μMID, determine the sample size required to obtain a test having α = .05 and β(μd)

Transcribed Image Text:

8 Car SUV Midsize 7 14213. 9.87 10120.3 12.65 25.23 14.23 12.47 14.00 13.17 27.48 12.42 32.59 12.98