- You Work For A Consumer Watchdog Publication And Are Testing The Advertising Claims Of A Tire Manufacturer The Manufact 1 (41.91 KiB) Viewed 78 times
- You Work For A Consumer Watchdog Publication And Are Testing The Advertising Claims Of A Tire Manufacturer The Manufact 2 (56.79 KiB) Viewed 78 times
You work for a consumer watchdog publication and are testing the advertising claims of a tire manufacturer. The manufacturer claims that the life spans of the tires are normally distributed, with a mean of 40,000 miles and a standard deviation of 7500 miles. You test 16 tires and get the following life spans. Complete parts (a) through (c) below. 48,422 42,802 28,024 37,530 32,760 41,665 41,886 37,689 24,328 33,549 37,285 38,588 31,846 36,008 34,967 46,194 Distance (in miles) Distance (in miles) Is it reasonable to assume that the life spans are normally distributed? Why? Choose the correct answer below. A. No, because the histogram is neither symmetric nor bell-shaped. B. Yes, because the histogram is neither symmetric nor bell-shaped. c. Yes, because the histogram is symmetric and bell-shaped. D. No, because the histogram is symmetric and bell-shaped. (b) Find the mean of your sample. The mean is 37096.4. (Round to one decimal place as needed.) Find the standard deviation of your sample. The standard deviation is (Round to one decimal place as needed.) Distance (in miles)
min = 24,328 Emax 48,922 Brange = 48, 422-24,328 = 24094 D 240947 4819 ड しし UL LE || = 2 24,328 - 29,146 29,147-33,965 31 556|111=3 33966-38,784 36, 375/1/11=6 38785-43603 41194111 = 3 43604-48 422 46013 11=2 D D mean 37096.4 44444 standard deviation mid 26737 .५ → s = TECx=X) 2 h- 1 thistogram