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Chapter 11: Q. 57 (page 758)
Which of the following is the correct number of degrees of freedom for the chi-square test using these data?
a.
b.
c.
d.
e.
Option (a) The degrees of freedom for the chi-square test for this two-way table are .
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It鈥檚 hard for smokers to quit. Perhaps prescribing a drug to fight
depression will work as well as the usual nicotine patch. Perhaps combining the patch and
the drug will work better than either treatment alone. Here are data from a randomized,
double-blind trial that compared four treatments.
A 鈥渟uccess鈥� means that the subject did not smoke for a year following the start of the study.
a. Summarize these data in a two-way table.
b. Do the data provide convincing evidence of a difference in the effectiveness of the four
treatments at thesignificance level?
Preventing strokes Refer to Exercise . Which treatment seems to be most effective? Least effective? Justify your choices.
Video games To determine if there is a relationship between age and playing video games, the Pew Research Center asked randomly selected adults for their age and if they 鈥渆ver play video games on a computer, TV, game console, or portable device like a cell phone.鈥� Here is a two-way table summarizing the results of the study:
a. Construct a segmented bar graph to display the relationship between age group and response to the question about video games.
b. Describe the association shown in the segmented bar graph in part (a).
The National Longitudinal Study of Adolescent Health interviewed a random sample of teens (grades to ). One question asked, 鈥淲hat do you think are the chances you will be married in the next years?鈥� Here is a two-way table of the responses by gender:
Which of the following is the expected count of females who respond 鈥淎lmost certain鈥�?
a.
b.
c.
d.
e.
A random sample of traffic tickets given to motorists in a large city is examined. The tickets are classified according to the race or ethnicity of the driver. The results are summarized in the following table.
The proportion of this city's population in each of the racial/ethnic categories listed is as follows.
We wish to test : The racial/ethnic distribution of traffic tickets in the city is the same as the racial/ethnic distribution of the city's population.
Assuming is true, what is the expected number of Hispanic drivers who would receive a ticket?
a.
b.
c.
d.
e.
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