CONFIDENCE INTERVALS

You must show all work and provide detailed explanation of your solution.

Please make sure you use correct grammar, spelling, and punctuation when you are composing your post. You may have to use the t- table or z-table in the Appendix of your book to help you answer these questions.

Choosing a Distribution: Use a normal distribution or a t-distribution to construct a 95% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results. Use technology to construct the confidence interval.

27. Body Mass Index: In a random sample of 50 people, the mean body mass index (BMI) was 27.7 and the standard deviation was 6.12. Assume the body mass indexes are normally distributed.

28. Mortgages: In a random sample of 15 mortgage institutions, the mean interest rate was 4.99% and the standard deviation was 0.36%. Assume the interest rates are normally distributed.

**Reference this book for the appendix**

Larson, R., & Farber, B. (2012). Elementary statistics: Picturing the world. (5th ed.). Boston: Prentice Hall.

Subject | Mathematics |

Due By (Pacific Time) | 08/16/2013 10:00 pm |

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