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Chapter 5: Q 2.1. (page 305)
Make a two-way table that displays the sample space.
To determine if occurrences are independent and to approximate conditional probabilities, use the two-way table as a sample space.
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Government data show that of adults are full-time college students and that of adults are age or older. Since can we conclude that about of adults are college students or older? Why or why not?
Are you feeling stressed? (4.1) A Gallup Poll asked whether people experienced stress 鈥渁 lot of the day yesterday.鈥� Forty percent said they did. Gallup鈥檚 report said, 鈥淩esults are based on telephone interviews with national adults,
aged and older, conducted Jan.
(a) Identify the population and the sample.
(b) Explain how undercover could lead to bias in this survey.
Income tax returns Here is the distribution of the adjusted gross income (in thousands of dollars) reported on individual federal income tax returns
in a recent year:
(a) What is the probability that a randomly chosen return shows an adjusted gross income of or more?
(b) Given that a return shows an income of at least what is the conditional probability that the income is at least
In government data, a household consists of all occupants of a dwelling unit. Choose an American household at random and count the number of
people it contains. Here is the assignment of probabilities for your outcome:
The probability of finding people in a household is the same as the probability of finding people. These probabilities are marked ??? in the table of the distribution. The probability that a household contains 3 people must be
(a) (b) (c) (d) (e) between and, and we can say no more. 
During World War II, the British found that the probability that a bomber is lost through enemy action on a mission over occupied Europe was Assuming that missions are independent, find the probability that a bomber returned safely from missions.
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