AI-Powered Test Analyzer

A manufacturer claims that the mean weight of their product is 500 grams with a standard deviation of 15 grams. A sample of 25 products has a mean weight of 495 grams. Test at α = 0.05 if the mean weight is significantly different from 500 grams.

A company claims their average delivery time is less than 30 minutes. Test this claim at α = 0.01 significance level.

Test whether the variance of population A is greater than the variance of population B at the 0.05 significance level.