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T test and confidence interval

The data that you will be using for this exercise came from a survey of two insurance carriers.
The first carrier (C1) was compared against the second competitor (C2). The insurance company management team wants to know how Carrier 1 compared to the second carrier. Data from 159 respondents are included.
All of the 5 questions are rated on a scale of 1 to 5, with 1 being "much worse" and 5 being "much better"
a. Graph out each of the 5 variables in a histogram. You should have 5 histograms, on each display both the C1 and C2 data on the same graph. What can you see from these graphs?
b. Create 95% confidence intervals for the 5 that were collected on Carrier 1.
c. Perform 5 t-tests on the data comparing C1 to C2 on the 5 questions.


Solution Summary

Step by step method for testing the hypothesis under 5 step approach is discussed here. Excel template for each problem is also included. This template can be used to obtain the answers of similar problems. The solution also give the details of construction of confidence interval for mean.