Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

تمرين 81

Political Science: Georgia Democrats How Democratic is Georgia County-by-county results are shown for a recent election. For your convenience, the data have been sorted in increasing order (Source: County and City Data Book. 12th Edition, U.S. Census Bureau).
Percentage of Democratic Vote by Counties in Georgia

(a) Make a box-and-whisker plot of the data. Find the interquartile range.
(b) Grouped Data Make a frequency table using five classes. Then estimate the mean and sample standard deviation using the frequency table. Compute a 75% Chebyshev interval centered about the mean.
(c) If you have a statistical calculator or computer, use it to find the actual sample mean and sample standard deviation. Otherwise, use the values x = 2769 and x 2 = 132,179 to compute the sample mean and sample standard deviation.