BUSS1020 Study Guide - Final Guide: Box Plot, Quartile, Public Policy Polling

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Published on 4 Aug 2020
Department
Course
Professor
BUSS1020 Workshop 4
Learning the Basics
1. Two coins are tossed.
a. Give an example of a simple event
b. Give an example of a joint event
c. What is the complement of a head on the first toss?
d. What does the sample space consist of?
2. Consider the following contingency table:
B
B’
A
10
20
A’
20
40
What is the probability of event
a. A?
b. A’?
c. A and B?
d. A or B?
3. Do males or females feel more tense or stressed at work? A survey of employed
adults conducted online by Harris Interactive on behalf of the American Psychological
Association revealed the following:
Felt tense or stressed out at work
Gender
Yes
No
Male
244
495
Female
282
480
a. Give an example of a simple event
b. Give an example of a joint event
c. What is the complement of “Felt tense or stressed out at work”?
d. Why is “Male and felt tense or stressed out at work” a joint event?
4. 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 warranty related 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 needed 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 company?
c. Needs a warranty repair or was manufactured by a U.S. based company?
d. Needs a warranty repair or was not manufactured by a U.S. based company?
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