Write a business memo to the state transportation

Assignment Help Basic Statistics

Reference no: EM132559893

FILE Refer to the Lincolnville School District bus data.

a. Develop a 95% confidence interval for the mean bus maintenance cost.

b. Develop a 95% confidence interval for the mean bus odometer miles.

c. Write a business memo to the state transportation official to report your results.

Century National Bank

Refer to the description of Century National Bank at the end of the Review of Chapters 1-4 on page 129. When Mr. Selig took over as president of Century several years ago. the use of debit cards was just beginning. He would like an update on the use of these cards. Develop a 95% confi¬dence interval for the proportion of customers using these cards. On the basis of the confidence interval. is It reasonable to conclude that more than halt of the customers use a debit card? Write a brief report Interpreting the results.

Attachment:- Practice problems.rar

Reference no: EM132559893

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