Estimate of the proportion reporting inadequate service

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These are review questions for an exam: can you please explain every step and where the valued originate from?

FRED's VW is a Volkswagen car dealer and repair service in Worcester. A random sample of 144 recent customers found that 24 of them reported inadequate service over the past year.

What is a good estimate for the true proportion of FRED's customers that received inadequate service? What is the sampling distribution model for a good estimator of this proportion?

What is the 99% confidence interval for your estimate of the proportion reporting inadequate service?

To find the confidence interval, find

VW USA says that according to their evidence from all US VW dealers, the proportion unhappy with service is 0.10. A blogger is arguing that FRED's VW offers particularly poor service. Does the statistical evidence back up his claim? Carry out a hypothesis test of his claim. Use all four steps. Be sure to take note of the comments on the review sheet on how to formulate hypotheses. Would the dealer prefer a Type I error of 1 percent, 5 percent or 10 percent?

Reference no: EM132166881

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