problem 2: statistics

Data are provided to you on pizza delivery times (in minutes) for 2 different classifications of stores :local and chain stores. The goal here is to determine whether there is a significant difference in the mean delivery time between the store classifications: using software

A- generate summary statistics (central tendency and variability measures) for the two samples and briefly summarize what they say.

B- conduct a test of significance for the between the mean delivery of local and chain stores and (show the results) interpret the results.

C- construct a 95%confidence interval of the difference between the two population mean delivery time and interpret it.

D- finally, are there any other factors, besides the way the store is classified, that could possibly influence delivery times (try and list at least 2)? Include a brief explanation of each.