Figure 3.32 shows bootstrap distributions for the standard deviation of two different datasets. In each case, if appropriate, use the bootstrap distribution to estimate and interpret a 95% confidence interval for the population standard deviation. If not appropriate, explain why not.

Figure 3.32

(a) Standard deviation of prices of used Mustang cars (in thousands of dollars), introduced in Data 3.4 on page 209, with bootstrap distribution in Figure 3.32(a)
(b) Standard deviation of monthly sales of new Saab cars, introduced in Exercise 3.78 on page 202, with bootstrap distribution in Figure 3.32(b)

Transcribed Image Text:

Left Tail O Left Tail O Two-Tail Right Tail Two-Tail ERight Tail # sample = 3000 # sample = 3000 80 mpan = 157.722 mean = 10.721 st.dev. = 1.743 st.dev. = 42.933 70 200 60 150 50 40 100 30 20 50 10 150 10 11 13 14 6. 8. 12 15 50 100 200 10.721 157.722 (a) (b)