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Problem 5


Historically, the average height for males was believed to be 68 inches.  A doctor believes the average height has increased over the last 100 years.  He claims the average male is now 70 inches tall.  A random sample of 50 men had an average height of 68.9 inches and a standard deviation of 2.8 inches.  Use a 10% significance level and the p-value method to test the doctor’s claim. 


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