Crash testing is a highly expensive procedure to evaluate the ability of an automobile to withstand a serious accident.

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Crash Testing Is A Highly Expensive Procedure To Evaluate The Ability Of An Automobile To Withstand A Serious Accident 1 (19.04 KiB) Viewed 22 times

Crash testing is a highly expensive procedure to evaluate the ability of an automobile to withstand a serious accident. A simple random sample of 11 small cars were subjected to a head-on collision at 40 miles per hour. Of them 8 were totaled," meaning that the cost of repairs is greater than the value of the car. Another sample of 17 large cars were subjected to the same test, and 5 of them were totaled. Let Px represent the population proportion of small cars that are totaled and let pyrepresent the population proportion of large cars that are totaled. Find a 95% confidence interval for the difference px -py. Round the answers to four decimal places The 95% confidence interval is