For the data of Exercise 14.4.5:
(a) Obtain a dotplot.
(b) Describe the data, such as mean, median, and standard deviation.
(c) Obtain a 95% confidence interval for the mean.
(d) Obtain a 95% prediction interval.
(e) Explain your solutions and state any assumptions.
Exercise 14.4.5
Given in the following table are 15 randomly selected state expenditures (in millions of dollars) for the fiscal year 1997 (source: The World Almanac and Book of Facts 2000).
5,722 7,685 13,862 21,975 35,302 4,441 16,200 25,791
4,808 5,130 2,426 39,296 4,002 6,818 7,145
(a) Test the data for normality.
(b) If the data are not normal, try a suitable transformation to make the transformed data approximately normal.