Concept explainers
a.
To find: The mean of the sampling distribution of
a.
Answer to Problem 4CRE
The mean is 0.15.
Explanation of Solution
Given:
The mean of the sampling distribution can be calculated as:
Here, mean is 0.15
b.
To find: The standard deviation of the sample proportion.
b.
Answer to Problem 4CRE
The standard deviation is 0.0091.
Explanation of Solution
The standard deviation of the sample proportion is computed as:
Thus, the standard deviation is 0.0091.
c.
To find: Whether the normality assumptions are satisfied or not.
c.
Explanation of Solution
Here,
Thus, normal approximation could be used here.
d.
To find: The
d.
Answer to Problem 4CRE
The probability is 0.9722.
Explanation of Solution
The probability that between 13% and 17% of the sample of 1540 adults are joggersis computed as:
Thus, the probability is 0.9722.
Chapter 7 Solutions
The Practice of Statistics for AP - 4th Edition
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