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Chapter 1: Q T1.5. (page 79)
The percentage of students with less than $10 in their possession is closest to
(a) 30%. (b) 35%. (c) 50%. (d) 60%. (e) 70%
The correct option is (c)
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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鈥檛 use it. Here are data on attitudes toward coffee filters made of recycled paper among people who do and don鈥檛 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?
Hit movies According to the Internet Movie Database, Avatar is tops based on box office sales worldwide. The following table displays data on several popular movies.
(a) What individuals does this data set describe?
(b) Clearly identify each of the variables. Which are quantitative? In what units do you think they are measured?
(c) Describe the individual in the highlighted row.
or, in general, compare related quantities.
One of the following scores was omitted from the stem plot below:
The missing number is
Race and the death penalty Whether a convicted murderer gets the death penalty seems to be influenced by the race of the victim. Here are data on
cases in which the defendant was convicted of murder:
(a) Use these data to make a two-way table of the defendant鈥檚 race (white or black) versus the death penalty (yes or no).
(b) Show that Simpson鈥檚 paradox holds: a higher percent of white defendants are sentenced to death overall, but for both black and white victims a higher percent of black defendants are sentenced to death.
(c) Use the data to explain why the paradox holds in the language that a judge could understand.
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