Introduction To Probability And Statistics
15th Edition
ISBN: 9781337554428
Author: Mendenhall, William.
Publisher: Cengage Learning,
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Chapter 5, Problem 10RWYL
Psychosomatic Problems A psychiatrist believesthat 80% of all people who visit doctors have problemsof a psychosomatic nature. She decides to select 25patients at random to test her theory.
- Assuming that the psychiatrist’s theory is true, whatis the
expected value of x. the number of the 25patients who have psychosomatic problems? - What is the variance of x, assuming that the theoryis true? Find
- (Use tables and assume that thetheory is true.)
- Based on the
probability in part e, if only 14 of the25 sampled had psychosomatic problems. What conclusions would you make about the psychiatrist’s theory? Explain.
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Worksheet 10
Jesse runs a small business selling and delivering mealie meal to the spaza shops.
He charges a fixed rate of R80, 00 for delivery and then R15, 50 for each packet of
mealle meal he delivers. The table below helps him to calculate what to charge
his customers.
10
20
30
40
50
Packets of mealie
meal (m)
Total costs in Rands
80
235
390
545
700
855
(c)
10.1.
Define the following terms:
10.1.1. Independent Variables
10.1.2. Dependent Variables
10.2.
10.3.
10.4.
10.5.
Determine the independent and dependent variables.
Are the variables in this scenario discrete or continuous values? Explain
What shape do you expect the graph to be? Why?
Draw a graph on the graph provided to represent the information in the
table above.
TOTAL COST OF PACKETS OF MEALIE MEAL
900
800
700
600
COST (R)
500
400
300
200
100
0
10
20
30
40
60
NUMBER OF PACKETS OF MEALIE MEAL
Chapter 5 Solutions
Introduction To Probability And Statistics
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