6126FA09H03 - STA 6126 Homework #3 Fall 2009 1. Refer to...

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STA 6126 Homework #3 Fall 2009 1. Refer to the calories data containing daily caloric intake data for 64 pregnant women based on reported “intake diaries.” If you’re interested in details, see: Turner, R.E., Langkamp-Henken, B., Littell, R.C., Lukowski, M.J., Suarez, M.F., “Comparing Nutrient Intake from Food to the Estimated Average Requirements shows Middle- to Upper-income Pregnant Women Lack Iron and Possibly Magnesium,” J. of The American Dietetic Association , 103, 2003, 461-466. a. Construct a histogram of the data. Do you believe the data are approximately normally distributed (bell-shaped)? Why or why not? b. Compute the mean, median, and standard deviation of the data. c. Compute the percentage of data that fall within 1, 2 and 3 standard deviations of the mean. Do these percentages agree suitably with the empirical rule? d. Construct a box-plot of the data. d. Delete the “outlier” value from the data set, and compute the mean, median, and standard deviation of the reduced data set. Describe how they change after removing the outlier.
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This note was uploaded on 01/15/2012 for the course STA 6126 taught by Professor Yesilcay during the Spring '08 term at University of Florida.

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