Chapter 1: Q 102. (page 73)
Which of the distributions shown has a larger standard deviation? Justify your answer.

Short Answer
The graph of a variable will have a higher standard deviation.
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Chapter 1: Q 102. (page 73)
Which of the distributions shown has a larger standard deviation? Justify your answer.

The graph of a variable will have a higher standard deviation.
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Popular colours鈥攈ere and there Favorite vehicle colours may differ among countries. The side-by-sidebar graph shows data on the most popular colours of cars in 2008 for the United States and Europe. Write a few sentences comparing the two distributions.

Buying music online Young people are more likely than older folk to buy music online. Here are the percent's of people in several age groups who bought music online in :
(a) Explain why it is not correct to use a pie chart to display these data.
(b) Make a bar graph of the data. Be sure to label your axes and title your graph.

The histogram below shows the distribution of the percent of women aged and over who have never married in each of the states and the District of Columbia.

In about what percent of states have at least of women aged and over never married?
(a) (b) (c)(d) (e)
Baseball paradox Most baseball hitters perform differently against right-handed and left-handed pitching. Consider two players, Joe and Moe, both of whom bat right-handed. The table below records their performance against right-handed and left-handed pitchers:

(a) Use these data to make a two-way table of player (Joe or Moe) versus outcome (hit or no hit).
(b) Show that Simpson鈥檚 paradox holds: one player has a higher overall batting average, but the other player hits better against both left-handed and right-handed pitching.
(c) The manager doesn鈥檛 believe that one player can hit better against both left-handers and right-handers yet have a lower overall batting average. Explain in
simple language why this happens to Joe and Moe.
National Survey of Adolescent Health interviewed several thousand teens (grades 7 to 12). One question asked was 鈥淲hat do you think are the chances you will be married in the next ten years?鈥 Here is a two-way table of the
responses by gender:
Your percent from the previous exercise is part of
(a) the marginal distribution of gender.
(b) the marginal distribution of opinion about marriage.
(c) the conditional distribution of gender among adolescents with a given opinion.
(d) the conditional distribution of opinion among adolescents of a given gender.
(e) the conditional distribution of females among those who said 鈥淎lmost certain.

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