A large philanthropic organization keeps records on the people who have contribu

Question

A large philanthropic organization keeps records on the people who have contributed to their cause. The organization buys demographic data on neighborhoods. A histogram and summary statistics for the percentage of whites in the neighborhoods of 500 donors are shown to the right. Complete parts (a) through (e). a) Which is a better summary of the percentage of white residents in the neighborhoods, the mean or the median? Explain. The is a better summary because the data b) Which is a better summary of the spread, the IQR or the standard deviation? The is a better summary of the spread because the data c) From a normal model, about what percentage of neighborhoods should have a percent white residents within three standard deviations of the mean? A. 99.7% B. 95% C. 97% D. 64.8% E. 83% F. 68% d) What percentage of neighborhoods actually have a percent white within three standard deviations of the mean? A. Between 75% and 80% B. Between 20% and 25% C. Between 95% and 100% D. Between 85% and 90% e) Explain the problem in using the normal model for these data. Select all that apply A. The data contain gaps and/or outliers. B. The data are not bimodal. C. The distribution is skewed to the right. D. The distribution is skewed to the left. E. The data are symmetric. F. The data are not unimodal.

Explanation / Answer

a)The histogram is a better summary because the data is skewed.

If skewed is not in the options, do comment below and tell the options.

b)The summary statistics is a better summary because the data is aggregated.

If aggregated is not in the options, do comment below and tell the options.

c)Within 3SD->Normal=99.7%

d)%witin 3SD->c)95% and 100%

e)The distribution is skewed to the left

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