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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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The instructor takes her sample by gathering data on five randomly selected students from each Lake Tahoe Community College math class. The type of sampling she used is
a. cluster sampling
b. stratified sampling
c. simple random sampling
d. convenience sampling
Sixty adults with gum disease were asked the number of times per week they used to floss before their diagnosis. The (incomplete) results are shown in Table
a. Fill in the blanks in Table
b. What percent of adults flossed six times per week?
c. What percent flossed at most three times per week?
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?
A local radio station has a fan base of listeners. The station wants to know if its audience would prefer
More music or more talk shows. Asking all listeners is an almost impossible task.
The station uses convenience sampling and surveys the first people they meet at one of the station鈥檚 music concert events. people said they鈥檇 prefer more talk shows, and 176 people said they鈥檇 prefer more music.
Do you think that this sample is representative of (or is characteristic of) the entire listener population?
Nineteen immigrants to the U.S were asked how many years, to the nearest year, they have lived in the U.S. The data are as follows:
Table was produced.
a. Fix the errors in Table . Also, explain how someone might have arrived at the incorrect number(s).
b. Explain what is wrong with this statement: 鈥�percent of the people surveyed have lived in the U.S. for 测别补谤蝉.鈥�
c. Fix the statement in b to make it correct.
d. What fraction of the people surveyed have lived in the U.S. five or seven years?
e. What fraction of the people surveyed have lived in the U.S. at most years?
f. What fraction of the people surveyed have lived in the U.S. fewer than years?
g. What fraction of the people surveyed have lived in the U.S. from five to years, inclusive?
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