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Chapter 11: Q. 5 (page 734)
T11.5. We compute the value of thestatistic to be . Assuming that the conditions for inference are met, the P-value of our test is
(a) greater than
(b) between and .
(c) between and .
(d) between and
(e) less than
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Perform a follow-up analysis of the test in Exercise 40 by finding the individual components of the chi-square statistic. Which cell(s) contributed most to the final result?
Which of the following explains why one of the conditions for performing the chi-square test is met in this case?
(a) The sample is large, teenagers in all.
(b) The sample is random.
(c) All the observed counts are greater than .
(d) We used software to do the calculations.
(e) Both variables are categorical.
Mars, Inc., reports that their M&M’S Peanut Chocolate Candies are produced according to the following color distribution: 23% each of blue and orange, 15% each of green and yellow, and 12% each of red and brown. Joey bought a bag of Peanut Chocolate Candies and counted the colors of the candies in his sample: 12 blue, 7 orange, 13 green, 4 yellow, 8 red, and 2 brown
State appropriate hypotheses for testing the company’s claim about the color distribution of peanut M&M’S
Do students who read more books for pleasure tend to earn higher grades in English? The boxplots below show data from a simple random sample of students at a large high school. Students were classified as light readers if they read fewer than books for pleasure per year. Otherwise, they were classified as heavy readers. Each student's average English grade for the previous two marking periods was converted to a GPA scale where and so on.
Reading and grades (1.3) Write a few sentences comparing the distributions of English grades for light and heavy readers.
Aspirin prevents blood from clotting and so helps prevent strokes. The Second European Stroke Prevention Study asked whether adding another anticlotting drug named dipyridamole would be more effective for patients who had already had a stroke. Here are the data on strokes during the two years of the study:
(a) Summarize these data in a two-way table.
(b) Make a graph to compare the rates of strokes for the four treatments. Describe what you see.
(c) Explain in words what the null hypothesis : p1 = p2 = p3 = p4 says about the incidence of strokes.
(d) Find the expected counts if H0 is true, and display them in a two-way table similar to the table of observed counts
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