Read Section 3.3
- On page 191, do # 1,8,11,17,18,19 (For problem 19, make a dot plot
instead of a histogram, and ignore the part about "weighted mean".)
- Problem 16: In 2001, a survey of people who had home access to the Internet asked them how much they paid per month for that access, rounded to the nearest dollar. The following data were collected: 5,9,10,10,10,12,12,19,19,19,20,20,20,20,20,21,21,21,22,33,37,42,58. Make a dotplot of the data on the cost of Internet access. Find the mean and the median of the data. Which of these gives a better answer to the question "How much did a typical person with Internet access pay for that service in 2001?"
- Problem 17: Make up a list of 20 numbers that is skewed to the right. Make a dotplot to support your answer. Which is bigger: the mean or median (don't actually compute these numbers.)
- Problem 18: Make two different lists of 10 numbers whose 20%-trimmed mean is 5.
- Problem 19: A businesswoman calculates that the median cost of the five business trips that she took in a month is $600 and concludes that the total cost must have been $3000. Explain why her conclusion is not valid. Give an example (using specific numbers) that shows that hte conclusion need not follow from the information.
- Problem 20: A real estate agent notes that the mean housing price for an area is $100,000 and concludes that half of the houses in the area cost more than that. Explain why the conclusion is not valid. Give an example (using specific numbers) that shows that the conclusion need not follow from the information.
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