Are women’s feet getting bigger? Retailers in the last 20 years
have had to increase their stock of larger sizes. WalMart Stores,
Inc., and Payless ShoeSource, Inc., have been aggressive in
stocking larger sizes, and Nordstrom’s reports that its larger
sizes typically sell out first. Assuming equal variances, at
α = .025, do these random shoe size samples of 12 randomly
chosen women in each age group show that women’s shoe sizes have
increased?
Born in 1980: | 8 | 7.5 | 8.5 | 8.5 | 8 | 7.5 | 9.5 | 7.5 | 8 | 8 | 8.5 | 9 |
Born in 1960: | 8.5 | 7.5 | 8 | 8 | 7.5 | 7.5 | 7.5 | 8 | 7 | 8 | 7 | 8 |
(a) Choose the appropriate hypotheses assuming
equal variances at α = .025.
a
b
c
d
(b) The average shoe size of women has
increased.
True
False
Are women’s feet getting bigger? Retailers in the last 20 years have had to increase their stock of larger sizes. WalMar...
Are women’s feet getting bigger? Retailers in the last 20 years have had to increase their stock of larger sizes. WalMart Stores, Inc., and Payless ShoeSource, Inc., have been aggressive in stocking larger sizes, and Nordstrom’s reports that its larger sizes typically sell out first. Assuming equal variances, at α = .025, do these random shoe size samples of 12 randomly chosen women in each age group show that women’s shoe sizes have increased? Born in 1980: 8 7.5 8.5...
Retailers who sell women’s shoes such as Wal-Mart, Nordstrom’s, and Payless Shoes have all reported that, more and more often, their larger shoe sizes are the ones that typically sell out first. These businesses have all therefore been aggressively stocking larger shoe sizes under the assumption that women’s feet have been getting bigger over time. Someone wants to test whether this hypothesis is true and has randomly sampled 12 women who were born in 1960 plus 12 who were born...
Researchers at the Mayo Clinic have studied the effect of sound levels on patient healing and have found a significant association (louder hospital ambient sound level is associated with slower postsurgical healing). Based on the Mayo Clinic's experience, Ardmore Hospital installed a new vinyl flooring that is supposed to reduce the mean sound level (decibels) in the hospital corridors. The sound level is measured at five randomly selected times in the main corridor. New Flooring Old Flooring 42 48 41...