Chapter 1: Q 1.2. (page 31)
The Fathom dot plot displays data on the number of siblings reported by each student in a statistics class.

Describe the center of the distribution.
Short Answer
The centre of distribution in this graph is 2.
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Chapter 1: Q 1.2. (page 31)
The Fathom dot plot displays data on the number of siblings reported by each student in a statistics class.

Describe the center of the distribution.
The centre of distribution in this graph is 2.
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Olympic gold! The following table displays the total number of gold medals won by a sample of countries in the Summer Olympic Games in China.
(a) Make a dot plot to display these data. Describe the overall pattern of the distribution and any deviations from that pattern.
(b) Overall, countries participated in the Summer Olympics, of which won at least one gold medal. Do you believe that the sample of countries listed in the table is representative of this larger population? Why or why not?

A study in Sweden looked at former elite soccer players, people who had played soccer but not at the elite level, and people of the same age who did not play soccer. Here is a two-way table that classifies these individuals by whether or not they had arthritis of the hip or knee by their mid-fifties:
(a) What percent of the people in this study were elite soccer players? What percent had arthritis?
(b) What percent of the elite soccer players had arthritis? What percent of those who had arthritis were elite soccer players?

Earthquake intensities are measured using a device called a seismograph, which is designed to be most sensitive to earthquakes with intensities between 4.0 and 9.0 the Richter scale. Measurements of nine earthquakes gave the following readings:

where L indicates that the earthquake had an intensity below 4.0 and an H indicates that the earthquake had an intensity above 9.0. The median earthquake intensity of the sample is (a) 5.75. (c) 6.47. (e) Cannot be determined. (b) 6.00. (d) 8.70.
Shopping spree A marketing consultant observed 50 consecutive shoppers at a supermarket. One variable of interest was how much each shopper spent in the store. Here are the data (in dollars), arranged in
increasing order:
(a) Round each amount to the nearest dollar. Then make a stem plot using tens of dollars as the stems and dollars as the leaves.
(b) Make another stem plot of the data by splitting stems. Which of the plots shows the shape of the distribution better?
(c) Write a few sentences describing the amount of money spent by shoppers at this supermarket.

Phone numbers the dot-plot below displays the last digit of phone numbers chosen at random from a phone book. Describe the shape of the distribution. Does this shape make sense to you? Explain.

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