Question
You take a sample of size 35 from a very large population in which the true proportion of males is \( p=0.52 \). Which of the statements below best describes what is known about the sampling distribution of \( \hat{p} \), the sample proportion of males?
Ask by Fuentes Boone. in the United States
Feb 26,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
The sampling distribution of \( \hat{p} \) is approximately normal with a mean of 0.52 and a standard deviation of approximately 0.084.
Solution
To determine what is known about the sampling distribution of \( \hat{p} \), the sample proportion of males, we can use the properties of the sampling distribution of a proportion.
Given:
- Sample size \( n = 35 \)
- True proportion of males in the population \( p = 0.52 \)
The sampling distribution of \( \hat{p} \) is approximately normal with mean \( p \) and standard deviation \( \sqrt{\frac{p(1-p)}{n}} \).
Therefore, the sampling distribution of \( \hat{p} \) is approximately normal with mean \( 0.52 \) and standard deviation \( \sqrt{\frac{0.52(1-0.52)}{35}} \).
Let's calculate the standard deviation of the sampling distribution of \( \hat{p} \).
Calculate the value by following steps:
- step0: Calculate:
\(\sqrt{\frac{0.52\left(1-0.52\right)}{35}}\)
- step1: Subtract the numbers:
\(\sqrt{\frac{0.52\times 0.48}{35}}\)
- step2: Multiply the numbers:
\(\sqrt{\frac{0.2496}{35}}\)
- step3: Divide the terms:
\(\sqrt{\frac{156}{21875}}\)
- step4: Use the properties of radicals:
\(\frac{\sqrt{156}}{\sqrt{21875}}\)
- step5: Simplify the expression:
\(\frac{2\sqrt{39}}{25\sqrt{35}}\)
- step6: Multiply by the Conjugate:
\(\frac{2\sqrt{39}\times \sqrt{35}}{25\sqrt{35}\times \sqrt{35}}\)
- step7: Multiply the numbers:
\(\frac{2\sqrt{1365}}{25\sqrt{35}\times \sqrt{35}}\)
- step8: Multiply the numbers:
\(\frac{2\sqrt{1365}}{875}\)
The standard deviation of the sampling distribution of \( \hat{p} \) is approximately \( 0.084448 \).
Therefore, the statement that best describes what is known about the sampling distribution of \( \hat{p} \) is that it is approximately normal with mean \( 0.52 \) and standard deviation \( 0.084448 \).
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