Math 200 Test 2 Review With Answer Key - 2013
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11Math 200
Test 2 Review
Spring 2013
The solution page shows you the correct answer and the section in each chapter where you can find information for
the problem. On the solutions page Chapter 4 is Elementary Probability (Chapter 5 in your book), Chapter 5 is
Binomial Probability (Chapter 6 in your book), and Chapter 9 is Correlation and Regression (Chapter 4 in your
book).
.
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. John runs a computer software store. He counted 124 people who walked by his store in a day, 54 of whom
came into the store. Of the 54, only 22 bought something in the store. Estimate the probability that a person
who walks into the store will buy something. Round your answer to the nearest hundredth.
A) 0.44
B) 0.18
C) 0.41
D) 0.61
E) none of these choices
____
2. John runs a computer software store. He counted 120 people who walked by his store in a day, 57 of whom
came into the store. Of the 57, only 20 bought something in the store. Estimate the probability that a person
who walks by the store will come in and buy something. Round your answer to the nearest hundredth.
A) 0.11
B) 0.17
C) 0.64
D) 0.35
E) none of these choices
____
3. Diagnostic tests of medical conditions have several results. The rest result can be positive or negative. A
positive test (+) indicates the patient has the condition. A negative test (–) indicates the patient does not have
the condition. Remember, a positive test does not prove the patient has the condition. Additional medical
work may be required. Consider a random sample of 128 patients, some of whom have a medical condition
and some of whom do not. Results of a new diagnostic test for the condition are shown.
Condition Present
Condition Absent
Row Total
Test Result +
107
21
128
Test Result –
21
45
66
Column Total
128
66
194
Assume that the sample is representative of the entire population. For a person selected at random, find
P(getting test result + and condition present). Round your answer to the nearest hundredth.
A) 0.66
B) 0.84
C) 0.55
D) 1.62
E) none of these choices
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