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Chapter 6: Q.75 (page 403)
Blood types In the United States, of adults have type O blood. Suppose we choose U.S. adults at random. Let the number who have type O blood. Use the binomial probability formula to find . Interpret this result in context.
The chance of out of people with O blood type is .
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81. Random digit dialing When an opinion poll calls residential telephone numbers at random, only of the calls reach a live person. You watch the random digit dialing machine make calls. Let the number of calls that reach a live person.
(a) Find and interpret .
(b) Find and interpret .
Predicting posttest scores() What is the equation of the linear regression model relating posttest and pretest scores? De铿乶e any variables used.
The standard deviation of is
(a)
(b)
(c)
(d)
(e)
Ms. Hall gave her class a -question multiple-choice quiz. Let the number of questions that a randomly selected student in the class answered correctly. The computer output below gives information about the probability distribution of X. To determine each student鈥檚 grade on the quiz (out of localid="1649489099543" ), Ms. Hall will multiply his or her number of correct answers by 10. Let localid="1649489106434" the grade of a randomly chosen student in the class.
localid="1649489113566"
(a) Find the mean of localid="1649489121120" . Show your method.
(b) Find the standard deviation of localid="1649489127059" . Show your method.
(c) How do the variance of localid="1649489132289" and the variance oflocalid="1649489138146" compare? Justify your answer.
14. . Life insurance A life insurance company sells a term insurance policy to a -year-old male that pays if the insured dies within the next years. The probability that a randomly chosen male will die each year can be found in mortality tables. The company collects a premium of each year a payment for the insurance. The amount that the company earns on this policy is per year, less the that it must pay if the insured dies. Here is a partially completed table that shows information about risk of mortality and the values of profit earned by the company:
(a) Copy the table onto your paper. Fill in the missing values of .
(b) Find the missing probability. Show your work.
(c) Calculate the mean .Interpret this value in context
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