Comparing the response times between 2 cab companies

Comparing the response times between 2 cab companies. companies A and B were each called at 50 randomly selected times. the calls to company A were independently made from the calls to company B. company A had a mean response time of 8.5 minutes with a standard deviation of 1.8 min. company B had a mean response time of 5.5 minutes with a standard deviation of 1.6 min. use a 0.05 significance level to test the claim that the mean response time for company A differs from the mean response time for company B.

state the null and alternative hypotheses symbolically and identify which represents the claim

determine whether the hypotheses tailed test is a one tailed test or two tailed test and whether or not to use a z-test or a t-test explain

identify the critical values and identify the rejection regions

us the appropriate test to find the appropriate test statistic. can use technology for this question and results

base on test statistic and rejection region the decision

interpret your decision in context of the original claim

construct a 95% confidence interval estimate of the difference between the mean response time for Company A and B 
interpret interval in context of the original claim