(Answered) The medical rehabilitation foundation reports that the

Finance

The Medical Rehabilitation Foundation reports that the average cost of rehabilitation for stroke victims is at least $25,000. To check this claim, a researcher selects a random number sample of 45 stroke victims and finds that the average cost is $24,950. The standard deviation is $3500.

a) Test at α = .10

b) Construct a 95% two-sided confidence interval.

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