Problems 4.9, 4.15, 4.19, 4.23, 4.45, and 4.49 in the textbook. 4.9 Referring to the contingency table in Problem 4.8, if an employed adult is
Referring to the contingency table in Problem 4.8, if an employed
adult is selected at random, what is the probability that
a. the employed adult felt tense or stressed out at work?
b. the employed adult was a male who felt tense or stressed out at
c. the employed adult was a male or felt tense or stressed out at
d. Explain the difference in the results in (b) and (c).
Each year, ratings are compiled concerning the performance
of new cars during the first 90 days of use. Suppose that the cars
have been categorized according to whether a car needs warrantyrelated
repair (yes or no) and the country in which the company
manufacturing a car is based (United States or not United States).
Based on the data collected, the probability that the new car needs
a warranty repair is 0.04, the probability that the car was manufactured
by a U.S.-based company is 0.60, and the probability that the
new car needs a warranty repair and was manufactured by a U.S.-
based company is 0.025. Construct a contingency table to evaluate
the probabilities of a warranty-related repair. What is the probability
that a new car selected at random
a. needs a warranty repair?
b. needs a warranty repair and was manufactured by a U.S.-based
c. needs a warranty repair or was manufactured by a U.S.-based
d. needs a warranty repair or was not manufactured by a U.S.-
If P1A2 = 0.7, P1B2 = 0.6, and A and B are independent,
find P(A and B)..
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