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Chapter 10: Q. 10 (page 668)
Let represent the score when a fair six-sided die is rolled. For this random variable, and . If the die is rolled times, what is the approximate probability that the total score is at least?
Result is:
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Many new products introduced into the market are targeted toward children. The choice behavior of children with regard to new products is of particular interest to companies that design marketing strategies for these products. As part of one study, randomly selected children in different age groups were compared on their ability to sort new products into the correct product category (milk or juice). Here are some of the data:
Are these two age groups equally skilled at sorting? Use information from the Minitab output below to support your answer.
Dropping out You have data from interviews with a random sample of students who failed to graduate from a particular college in years and also from a random sample of students who entered at the same time and did graduate. You will use these data to compare the percentages of students from rural backgrounds among dropouts and graduates.
The U.S. Department of Agriculture (USDA) conducted a survey to estimate the average price of wheat in July and in September of the same year. Independent random samples of wheat producers were selected for each of the two months. Here are summary statistics on the reported price of wheat from the selected producers, in dollars per bushel:
Construct and interpret a confidence interval for the difference in the mean wheat price in July and in September.
Based on your answer to Question , would you be surprised if the difference in the mean amount of liquid dispensed in the two samples wasounces? Explain
Shortly before the presidential election, a survey was taken by the school newspaper at a very large state university. Randomly selected students were asked, 鈥淲hom do you plan to vote for in the upcoming presidential election?鈥� Here is a two-way table of the responses by political persuasion for students:
Which of the following statements about these data is true?
(a) The percent of Republicans among the respondents is .
(b) The marginal distribution of the variable choice of candidate is given by Obama: ; McCain: ; Other:; Undecided: .
(c) About of Democrats reported that they planned to vote for McCain.
(d) About of those who are undecided are Independents.
(e) The conditional distribution of political persuasion among those for whom McCain is the candidate of choice is Democrat: ; Republican: ; Independent :
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