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Chapter 11: Q. 7 (page 734)
The appropriate degrees of freedom for the statistic is
(a) 1 .
(b) 2 .
(c) 3 .
(d) 4 .
(e) 5 .
Option is the correct answer.
The appropriate degrees of freedom for the statistic is .
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Refer to Exercise 37. Do the data provide convincing evidence of a difference in the effectiveness of the four treatments? Carry out an appropriate test at the significance level
A survey by the National Institutes of Health asked a random sample of young adults (aged 19 to 25 years), “Where do you live now? That is, where do you stay most often?” Here is the full two-way table (omitting a few who refused to answer and one who claimed to be homeless):
a) Should we use a chi-square test for homogeneity or a chi-square test of association/independence in this setting? Justify your answer.
(b) State appropriate hypotheses for performing the type of test you chose in part (a). Minitab output from a chi-square test is shown below
(c) Check that the conditions for carrying out the test are met.
(d) Interpret the P-value in context. What conclusion would you draw?
Reading and grades (10.2) Summary statistics for the two groups from Minitab are provided below.
(a) Explain why it is acceptable to use two-sample t procedures in this setting.
(b) Construct and interpret a confidence interval for the difference in the mean English grade for light and heavy readers.
(c) Does the interval in part (b) provide convincing evidence that reading more causes an increase in students’ English grades? Justify your answer.
The expected count of cases of lymphoma in homes with an HCC is
(a) .
(b) .
(c) .
(d) .
(e) None of these.
Who were the popular kids at your elementary school? Did they get good grades or have good looks? Were they good at sports? A study was performed to examine the factors that determine social status for children in grades , and . Researchers administered a questionnaire to a random sample of students in these grades. One of the questions they asked was “What would you most like to do at school: make good grades, be good at sports, or be popular?” The two-way table below summarizes the students’ responses.
(a) Construct an appropriate graph to compare male and female responses. Write a few sentences describing the relationship between gender and goals.
(b) Is there convincing evidence of an association between gender and goals for elementary school students? Carry out a test at the localid="1653534557186" level and report your conclusion.
(c) Which cell contributes most to the chi-square statistic in part (b)? Explain
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