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Chapter 1: Q 1.2. (page 55)
Here, once again, is the stem plot of travel times to work for randomly selected New Yorkers. Earlier, we found that the median was
Use your calculator to find the mean travel time. Was your answer to Question correct?
The mean of is effectively bigger than the median of
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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?
The National Survey of Adolescent Health interviewed several thousand teens (grades to ). One question asked was “What do you think are the chances you will be married in the next ten years?” Here is a two-way table of the responses by gender:
What percent of females thought that they were almost certain to be married in the next ten years?
(a) About (c) About (e) About
(b) About (d) About
A class survey Here is a small part of the data set that describes the students in an AP Statistics class. The data come from anonymous responses to a questionnaire filled out on the first day of class.
a. What individual does with the data set describe
b. Identification of the quantitative variables
c. describe the individual in a highlighted row
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 Fathom dot plot displays data on the number of siblings reported by each student in a statistics class.
Describe the center of the distribution.
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