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Chapter 1: Q 109. (page 74)
Which of the following is least affected if an extreme high outlier is added to your data?
(a) Median
(b) Mean
(c) Standard deviation
(d) Range
(e) Maximum
The correct option is (a) Median.
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Here, once again, is the stem plot of travel times to work for randomly selected New Yorkers. Earlier, we found that the median was minutes.
Interpret your result from Question 2 in context without using the words 鈥渕ean鈥� or 鈥渁verage".
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?
Medical study variables Data from a medical study contain values of many variables for each of the people who were the subjects of the study. Here are some of the variables recorded: gender (female or male) age (years) race (Asian, black, white, or other); smoker (yes or no) systolic blood pressure (millimetres of mercury) level of calcium in the blood (micrograms per millilitre).
Identify each as categorical or quantitative.
The percentage of students with less than $10 in their possession is closest to
(a) 30%. (b) 35%. (c) 50%. (d) 60%. (e) 70%
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?
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