Concept explainers
(a)
Whether the larger random sample reduces the bias of the poll result or not.
(a)
Answer to Problem 18E
The sampling variability of the sample proportion changes from state to state.
Explanation of Solution
Here, if the
Hence, the larger random sample reduces the bias of the poll result.
(b)
Whether the sample reduces the variability of the result or not.
(b)
Answer to Problem 18E
The sample reduces the variability of the result.
Explanation of Solution
Here, if the sample is larger; then more information can be obtained about the distribution. Thus, the variability will be reduced as the distribution allows to make more accurate estimates.
Hence, the sample reduces the variability of the result.
Chapter 7 Solutions
The Practice of Statistics for AP - 4th Edition
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