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Chapter 1: Q.1.8. (page 11)
The data are the colors of houses. You sample five houses. The colors of the houses are white, yellow, white, red, and white. What type of data is this?
The colors white, yellow, white, red, and white are qualitative data.
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Table 1.13 represents the amount, in inches, of annual rainfall in a sample of towns. What fraction of towns
surveyed get between 11.03 and 13.05 inches of rainfall each year?
Use the following information to answer the next seven exercises: Studies are often done by pharmaceutical companies to determine the effectiveness of a treatment program. Suppose that a new AIDS antibody drug is currently under study. It is given to patients once the AIDS symptoms have revealed themselves. Of interest is the average (mean) length of time in months patients live once starting the treatment. Two researchers each follow a different set of 40 AIDS patients from the start of treatment until their deaths. The following data (in months) are collected.
Researcher A: 3; 4; 11; 15; 16; 17; 22; 44; 37; 16; 14; 24; 25; 15; 26; 27; 33; 29; 35; 44; 13; 21; 22; 10; 12; 8; 40; 32; 26; 27; 31; 34; 29; 17; 8; 24; 18; 47; 33; 34
Researcher B: 3; 14; 11; 5; 16; 17; 28; 41; 31; 18; 14; 14; 26; 25; 21; 22; 31; 2; 35; 44; 23; 21; 21; 16; 12; 18; 41; 22; 16; 25; 33; 34; 29; 13; 18; 24; 23; 42; 33; 29
Determine what the key term data refers to in the above example for Researcher A.
Use the following information to answer the next two exercises: Table contains data on hurricanes that have made direct hits on the U.S. Between and . A hurricane is given a strength category rating based on the minimum wind speed generated by the storm.
What is the relative frequency of direct hits that were AT MOST a category 3 storm?
a.
b.
c.
d.
For the following four exercises, determine the type of sampling used (simple random, stratified, systematic, cluster, or convenience).
A group of test subjects is divided into twelve groups; then four of the groups are chosen at random.
For the following exercises, identify the type of data that would be used to describe a response (quantitative discrete, quantitative continuous, or qualitative), and give an example of the data.
53. number of tickets sold to a concert.
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