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Chapter 1: Q. 1.1 (page 14)
Use the data in the two-way table on page 12 to calculate the marginal distribution (in percents) of gender.
The Marginal Distribution for Female and for male marginal distribution is
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You look at real estate ads for houses in Naples, Florida. There are many houses ranging from in price. The few houses on the water, however, have prices up to . The distribution of house prices will be
(a) skewed to the left.
(b) roughly symmetric.
(c) skewed to the right.
(d) unimodal.
(e) too high.
Dates on coins
(a) Sketch a dot-plot for a distribution that is skewed to the left.
(b) Suppose that you and your friends emptied your pockets of coins and recorded the year marked on each coin. The distribution of dates would be skewed to the left. Explain why.
You have data on the weights in grams of baby pythons. The mean weight is 31.8 and the standard deviation of the weights is . The correct units for the standard deviation are
(a) no units—it’s just a number.
(b) grams.
(c) grams squared.
(d) pythons.
(e) pythons squared
Attitudes toward recycled products Recycling is supposed to save resources. Some people think recycled products are lower in quality than other products, a fact that makes recycling less practical. People who actually use a recycled product may have different opinions from those who don’t use it. Here are data on attitudes toward coffee filters made of recycled paper among people who do and don’t buy these filters:
(a)How many people does this table describe? How many of these were buyers of coffee filters made of recycled paper?
(b)Give the marginal distribution of opinion about the quality of recycled filters. What percent of consumers think the quality of the recycled product is the same or higher than the quality of other filters?
The National Survey of Adolescent Health interviewed several thousand teens (grades to ). One question asked was “What do you think are the chances you will be married in the next ten years?” Here is a two-way table of the responses by gender:
The percentage of females among the respondents was
(a) (c) about . (e) None of these.
(b) (d) about 54%.
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