An automobile rustproofing company claims that their methods protect cars for 60 months. This hypothesis is tested against the alternative that the protection lasts for less than 60 months. A random sample of 100 cars produces an average time of 57 months with a standard deviation of 15 months.
-Test the hypothesis using the $5 \%$ significance level.

Question

Quizplus · Accepted Answer

The Answer of An automobile rustproofing company claims that their methods protect cars for 60 months. This hypothesis is tested against the alternative that the protection lasts for less than 60 months. A random sample of 100 cars produces an average time of 57 months with a standard deviation of 15 months.
-Test the hypothesis using the $5 \%$ significance level.

An Automobile Rustproofing Company Claims That Their Methods Protect Cars 5%5 \%5%

An Automobile Rustproofing Company Claims That Their Methods Protect Cars $5 \%$