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10. A new sneaker claims that it can make male athletes jump higher. A sample of 25 male athletes were asked to jump once with their own sneakers on and once wearing the new sneakers. The average jump increased by 1.5 inches with the new sneakers with a standard deviation of 1 inch. Find the following: (1) 90 %, (2) 95%, and (3) 99% condence interval for the average increase in jump with the new sneakers. Interpret your results 11. How much, on average, do full-time students pay for textbooks for a semester? We wish to produce a 90% confidence interval for the mean cost of textbooks for all full -time students. A random sample of the textbook costs of 25 full-time students has a mean price of 590. 32 php wiha-etandard-demahenef 54. 03. 12. Textbook authors must be careful that the reading level of their book is appropriate for the target audience. Some methods of assessing reading levels require estimating the average word length. You've randomly chosen 20 words from a randomly selected page in your textbook and counted the number of letters in each word. The results are shown below: 13.5, 5, 2, 11, 1, 5, 3, 8, 5 ,4 ,7 ,2 ,9 ,4 ,8 ,10 ,4 ,5, 6, 6 Construct a 98% confidence interval for the mean length of words in your textbook if the sample standard deviation is about 2.69 letters