Confidence interval for difference between mean speeds

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Reference no: EM132869119

An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. The company took a random sample of 36 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 3 miles per hour. Another sample of 20 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 4 miles per hour. Assume that the speeds at which all men and all women drive cars on this highway are both normally distributed with unequal population standard deviations.

(a) Construct a 90% confidence interval for the difference between the mean speeds of cars driven by all men and all women on this highway.

(b) Test at the 1% significance level whether the mean speed of cars driven by all men drivers on this highway is higher than that of cars driven by all women drivers.

Reference no: EM132869119

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