Question

A taxi company is trying to decide whether to purchase brand A or brand B tires for its fleet of taxis. To estimate the difference in the two​ brands, an experiment is conducted using 15 of each brand. The tires are run until they wear out. The sample average and standard deviation in kms for brand A are 35,400 and 4000 respectively. The sample average and standard deviation in kms for brand B are 37,800 and 6600 respectively. Compute a 99% confidence interval for   assuming that the populations are approximately normally distributed. You may not assume that the variances are equal

Answer 1

For Further queries, please comment Below.

Thank you.