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Chapter 1: Q. 70 (page 49)
One of the following
The number 92 is the one that is missing.
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Which of the following statements about this distribution is not correct?
(a) The histogram is right-skewed.
(b) The median is less than
(c) The IQR is
(d) The mean is greater than the median.
(e) The histogram is unimodal.
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?
Make a graph to display the marginal distribution. Describe what you see
Smoking by students and parents Here is data from a survey conducted at eight high schools on smoking among students and their parents:
(a)How many students are described in the two-way table? What per cent of these students smoke?
(b) Give the marginal distribution of parents’ smoking behaviour, both in counts and in percentages.
At the Census Bureau Web site, you can view detailed data collected by the American Community Survey. The table below includes data for 10 people chosen at random from the more than one million people in households contacted by the survey. “School” gives the highest level of education completed.
This data set contains
(a) 7 variables, 2 of which are categorical.
(b) 7 variables, 1 of which is categorical.
(c) 6 variables, 2 of which are categorical.
(d) 6 variables, 1 of which is categorical.
(e) None of these.
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