Concept explainers
(a)
To calculate: The population mean for the confidence interval of 90%.
(a)
Answer to Problem 68E
Thepopulation mean is from22.3735% to 27.1465%.
Explanation of Solution
Given information:
Sample size
Standard deviation
Population mean
Confidence interval
Formula used:
Degree of freedom
Margin of error
Calculation:
Find the degree of freedom, use the formula
The confidence level is 90%.
Convert 90% into decimal.
Find the column.
From table B find critical value
Thus, the critical value
Find the margin of error, use the formula
Now, calculate the population mean,
Hence, the required population mean is from 22.3735% to 27.1465%.
(b)
Explain the effect of the confidence interval for the survey of that one patient.
(b)
Answer to Problem 68E
The confidence interval cannot be generalizing for the sample population.
Explanation of Solution
From 68(a)confidence interval contain the population mean from22.3735% to 27.1465%.Since the confidence interval lies above 0.
Hence, the confidence interval cannot be generalizing for that one patient with HAV angle of 50 degrees.
Chapter 8 Solutions
The Practice of Statistics for AP - 4th Edition
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