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Chapter 1: Q.34 (page 52)
Is a sample size of 1,000 a reliable measure for a population of 5,000?
Yes, for a population of 5000, a sample size of 1000 is a reliable metric.
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Forbes magazine published data on the best small firms in . These were firms which had been publicly traded for at least a year, have a stock price of at least per share, and have reported annual revenue between million and billion. Table shows the ages of the chief executive officers for the first ranked firms.
a. What is the frequency for CEO ages between 54 and 65?
b. What percentage of CEOs are 65 years or older?
c. What is the relative frequency of ages under 50?
d. What is the cumulative relative frequency for CEOs younger than 55?
e. Which graph shows the relative frequency and which shows the cumulative relative frequency?
Seven hundred and seventy-one distance learning students at Long Beach City College responded to surveys in the academic year. Highlights of the summary report are listed in Table
a. What percent of the students surveyed do not have a computer at home?
b. About how many students in the survey live at least 16 miles from campus?
c. If the same survey were done at Great Basin College in Elko, Nevada, do you think the percentages would be the same? Why?
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
List two reasons why the data may differ.
A study was done to determine the age, number of times per week, and the duration (amount of time) of residents using a local park in San Antonio, Texas. The first house in the neighborhood around the park was selected randomly, and then the resident of every eighth house in the neighborhood around the park was interviewed.
鈥淒uration (amount of time)鈥� is what type of data?
a. qualitative(categorical); b. quantitative discrete; c. quantitative continuous
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?
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