A study is done to test the claim that company a retains it's workesrs longer that company B. Company A samples 16 workes , and their average time with the company is 5.2 years with a standard...

A study is done to test the claim that company a retains it's workesrs longer that company B. Company A samples 16 workes , and their average time with the company is 5.2 years with a standard deviation of 1.1. company B samples 21 workers, and their average time with the company is 4.6 years with a standard deviation of 0.9. the populations are normally distributed.