Concept explainers
a)
To find the population.
a)
Answer to Problem 9.19E
The population is all undergraduate students from courses in psychology and communication.
Explanation of Solution
Given:
n =
First need to understand about sample and population.
Population: It is the set of all the possible individuals possessing the characteristic of interest in a study.
Sample: it is the subset of population on which, the actual study performed and from which, the necessary measurements are taken.
Here, the population is all undergraduate students from courses in psychology and communication.
b)
To find the 99% confidence interval for p
b)
Answer to Problem 9.19E
The 99% confidence interval is, (0.7591,0.9259)
Explanation of Solution
Given:
C=confidence level = 0.99
Formula:
Confidence interval for population proportion is,
Sample proportion:
Margin of error:
Calculation:
Sample proportion:
Z critical value can be found either by using standard normal table or excel formula.
Therefore, level of significance = a = 1-0.99 = 0.01
So, Zc =Za/2 = Z0.01/2
Using excel
Zc = 2.58
Therefore, margin of error is,
99% confidence interval for population proportion,
We are 99% confident that the true proportion of undergraduate students from courses in psychology and communications that prayed at least a few times a year is between 0.7591 and 0.9259
Chapter 9 Solutions
Statistics Through Applications
Additional Math Textbook Solutions
Fundamentals of Statistics (5th Edition)
Statistics for Psychology
Essentials of Statistics (6th Edition)
Elementary Statistics (13th Edition)
Introductory Statistics (10th Edition)
Elementary Statistics: Picturing the World (7th Edition)
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