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Chapter 11: Q. 4 (page 734)
Assuming is true, the expected number of Hispanic drivers who would receive a ticket is
(a) 8
(c) 11.
(e) 12.
(b) 10.36
(d) 11.84
(d) 11.84
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The expected count of cases of lymphoma in homes with an HCC is
(a) .
(b) .
(c) .
(d) .
(e) None of these.
Aw, nuts! A company claims that each batch of its deluxe mixed nuts contains cashews, almonds,macadamia nuts, and 8% brazil nuts. To test this claim, a quality control inspector takes a random sample of nuts from the latest batch. The one-way table below displays the sample data.
(a) State appropriate hypotheses for performing a test of the company’s claim.
b) Calculate the expected counts for each type of nut. Show your work.
Reading and grades (3.2) The Fathom scatterplot below show the number of books read and the English grade for all students in the study. A least-squares regression line has been added to the graph.
(a) Interpret the meaning of the y-intercept in context.
(b) The student who reported reading books for pleasure had an English GPA of . Find this student’s residual. Show your work.
(c) How strong is the relationship between English grades and the number of books read? Give appropriate evidence to support your answer.
How is the hatching of water python eggs influenced by the temperature of the snake’s nest? Researchers randomly assigned newly laid eggs to one of three water temperatures: hot, neutral, or cold. Hot duplicates the extra warmth provided by the mother python, and cold duplicates the absence of the mother. Here are the data on the number of eggs and the number that hatched
(a) Make a two-way table of temperature by outcome (hatched or not). Calculate the proportion of eggs in each group that hatched. The researchers believed that eggs would not hatch in cold water. Do the data support that belief?
(b) Are the differences between the three groups statistically significant? Give appropriate evidence to support your answer
Roulette Casinos are required to verify that their games operate as advertised. American roulette wheels have slotsred, black, and green In one casino, managers record data from a random sample of spins of one of their American roulette wheels. The one-way table below displays the results.
(a) State appropriate hypotheses for testing whether these data give convincing evidence that the distribution of outcomes on this wheel is not what it should be.
(b) Calculate the expected counts for each color. Show your work.
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