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Chapter 1: Q.1.5. (page 10)
The data are the number of machines in a gym. You sample five gyms. One gym has machines, one gym has machines, one gym has ten machines, one gym has machines, and the other gym has machines. What type of data is this?
The numbers of machines are the quantitative discrete data.
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Determine what the key terms refer to in the following study. We want to know the average (mean) amount of money spent on school uniforms each year by families with children at Knoll Academy. We randomly survey 100 families with children in the school. Three of the families spent , , and , respectively.
1.18 Table 1.16 contains the total number of fatal motor vehicle traffic crashes in the United States for the period from 1994 to 2011.
Answer the following questions.
a. What is the frequency of deaths measured from 2000 through 2004?
b. What percentage of deaths occurred after 2006?
c. What is the relative frequency of deaths that occurred in 2000 or before?
d. What is the percentage of deaths that occurred in 2011?
e. What is the cumulative relative frequency for 2006? Explain what this number tells you about the data?
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?
Use the following data to answer the next five exercises: Two researchers are gathering data on hours of video games played by school-aged children and young adults. They each randomly sample different groups of 150 students from the same school. They collect the following data.
Give a reason why the data may differ.
鈥淣umber of times per week鈥� is what type of data?
a. qualitative(categorical); b. quantitative discrete; c. quantitative continuous
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