In reviewing your previous reports, several questions came to Elizabeth Burke's mind. Use point and interval estimates to help answer these questions.

1..What proportion of customers rate the company with "top box" survey responses (which is defined as scale levels 4 and 5) on quality, ease of use, price, and service in the 2014CustomerSurvey.csvworksheet data file? How do these proportions differ by geographic region?

3.Engineering has collected data on alternative process costs for building transmissions in the worksheet data fileTransmissionCosts.csv. Can you determine whether one of the proposed processes is better than the current process?

4.4.What would be a confidence interval for an additional sample of mower test performance as in the worksheet data fileMowerTest.csv?

5.For the data in the worksheet data fileBladeWeight.csv, what is the sampling distribution of the mean, the overall mean, and the standard error of the mean? Is a normal distribution an appropriate assumption for the sampling distribution of the mean?