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ECON 2843
Problem Set 3
1.
Problem 4.37 in Newbold on p. 114.
A survey carried out for a supermarket classified customers according to whether their
visits to the store are frequent or infrequent and to whether they often, sometimes, or
never purchase generic products.
The accompanying table gives the proportions of
people surveyed in each of the six joint classifications.
Frequency of
visit
Purchase of Generic Products
Often
Sometimes
Never
Frequent
0.12
0.48
0.19
Infrequent
0.07
0.06
0.08
a.
What is the probability that a customer is both a frequent shopper and often
purchases generic products?
b.
What is the probability that a customer who never buys generic products visits
the store frequently?
c.
Are the events “Never buys generic products” and “Visits the store frequently”
independent?
d.
What is the probability that a customer who infrequently visits the store often
buys generic products?
e.
Are the events “Often buys generic products: and “Visits the store infrequently”
independent?
f.
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 Spring '08
 HUDGINS

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