Concept explainers
(a)
To calculate: The confidence level for the sample in the survey.
(a)
Answer to Problem 47E
The confidence level is95%.
Explanation of Solution
Given information:
Margin of error
Sample proportion
Sample size
Formula used:
Margin of error
Calculation:
Sample proportion
Convert 64% into decimal.
Now, calculate the margin of error. Use the formula
Margin of error is 3%.
Convert 3% into decimal.
Substitute 0.03 for E in equation (1).
Calculate theconfidence level, use table A.
Thus the confidence level is 0.95.
Convert 0.95 into percentage.
Hence, the required confidence level is 95%.
(b)
Explain the reason that which of the practical difficulty lead to biased results for this survey.
(b)
Answer to Problem 47E
Nonresponse bias can lead to biased results for this survey.
Explanation of Solution
There are three practical difficulties that can lead to biased result in any survey. These are selection bias, response bias and nonresponse bias.
In this survey most teens will not participate in survey.
Hence, nonresponse bias can lead to biased results for this survey.
Chapter 8 Solutions
The Practice of Statistics for AP - 4th Edition
Additional Math Textbook Solutions
An Introduction to Mathematical Statistics and Its Applications (6th Edition)
Basic Business Statistics, Student Value Edition
Essentials of Statistics, Books a la Carte Edition (5th Edition)
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