Chapter 1: Q. 5`1. (page 48)
Feeling sleepy? Refer to Exercise 45. Describe the shape of the distribution.
Short Answer
Roughly symmetric
Single peak
No gaps
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Chapter 1: Q. 5`1. (page 48)
Feeling sleepy? Refer to Exercise 45. Describe the shape of the distribution.
Roughly symmetric
Single peak
No gaps
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Binge-watchingDo you 鈥渂inge-watch鈥 television series by viewing multiple episodes of a series at one sitting? A survey of 800 people who binge-watch were asked how many episodes is too many to watch in one viewing session. The results are displayed in the bar graph. Explain how this graph is misleading.

Risks of playing soccer (1.1) 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:

Part (a). What percent of the people in this study were elite soccer players? What percent of the people in this study developed arthritis?
Part (b). What percent of the elite soccer players developed arthritis? What percent of those who got arthritis were elite soccer players?
Part (c). Researchers suspected that the more serious soccer players were more likely to develop arthritis later in life. Do the data confirm this suspicion? Calculate appropriate percentages to support your answer.
Far from home A survey asked first-year college students, 鈥淗ow many miles is this college from your permanent home?鈥 Students had to choose from the following options: 5 or fewer, 6 to 10, 11 to 50, 51 to 100, 101 to 500, or more than 500. The side-by-side bar graph shows the percentage of students at public and private 4-year colleges who chose each option. Write a few sentences comparing the distributions of distance from home for students from private and public 4-year colleges who completed the survey.

Healthy streams Nitrates are organic compounds that are a main ingredient in fertilizers. When those fertilizers run off into streams, the nitrates can have a toxic effect on fish. An ecologist studying nitrate pollution in two streams measures nitrate concentrations at 42 places on Stony Brook and 42 places on Mill Brook. The parallel dotplots display the data. Compare the distributions of nitrate concentration in these two streams.

Medical study variables Data from a medical study contain values of many variables for each subject in the study. Some of the variables recorded were gender (female or male); age (years); race (Asian, Black, White, or other); smoker (yes or no); systolic blood pressure (millimeters of mercury); level of calcium in the blood (micrograms per milliliter). Classify each variable as categorical or quantitative.
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