Question: ALL ABOUT STATS How much, on average, do full-time students pay for textbooks for a semester? We wish to produce a 90% confidence interval for

ALL ABOUT STATS

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 u (whose value is unknown to us) of textbooks for all full-time students. A random sample of the textbook costs of 25 full-time students shows that the mean price is PHP590.32 with a standard deviation of PHP54.03.Textbook authors must be careful that the reading level of their book is appropri- ate for the target audience. Some methods of assessing reading level 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: 5,5, 2, 1 1, 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 (use the sample standard deviation s calculated to 1 decimal place)

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