(a)
To calculate: The population mean for the confidence interval of 99%.
(a)
Answer to Problem 67E
Thepopulation mean is between −4.5754% to −2.5986%.
Explanation of Solution
Given information:
Standard deviation
Population mean
Formula used:
Degree of freedom
Margin of error
Calculation:
Find the degree of freedom, use the formula
The confidence level is 99%.
Convert 99% into decimal.
Find the value of the column.
From table B find critical value
Thus, critical value
Find the margin of error, use the formula
Now, find the population mean.
Hence, the required population mean is between -4.5754% to -2.5986%.
(b)
Explain the reason whether or not the data gives good evidence that on the average nursing mothers lose bone mineral
(b)
Answer to Problem 67E
The data gives good evidence that on the average nursing mothers lose bone mineral
Explanation of Solution
From 67(a)confidence interval contain the population mean from -4.5754% to -2.5986%.Since the confidence interval lies below 0.
Hence, the data gives good evidence that on the average nursing mothers lose bone mineral.
Chapter 8 Solutions
The Practice of Statistics for AP - 4th Edition
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