Math Problem Statement
A population has parameters μ=160.6μ=160.6 and σ=33.4σ=33.4. You intend to draw a random sample of size n=197n=197.
What is the mean of the distribution of sample means? μ¯x=μx¯=
What is the standard deviation of the distribution of sample means? (Report answer accurate to 2 decimal places.) σ¯x=σx¯=
Solution
To solve these questions, we'll use the following concepts from statistics regarding the sampling distribution of the sample mean:
- Mean of the distribution of sample means (): This is the same as the population mean ().
- Standard deviation of the distribution of sample means (): This is also known as the standard error of the mean and is calculated using the formula:
Where:
- is the population standard deviation
- is the sample size
Given:
- Population mean () = 160.6
- Population standard deviation () = 33.4
- Sample size () = 197
Let's calculate the required values.The results are:
- The mean of the distribution of sample means, , is 160.6.
- The standard deviation of the distribution of sample means, , is 2.38.
Would you like a more detailed explanation, or do you have any questions?
Here are some related questions to explore further:
- How does increasing the sample size affect the standard error of the mean?
- What would be the standard error if the sample size was doubled?
- What is the probability that a sample mean falls within one standard deviation of the population mean?
- How would the standard deviation of the sample means change if the population standard deviation were different?
- What is the relationship between sample size and the accuracy of the sample mean as an estimate of the population mean?
- What assumptions are required for the Central Limit Theorem to apply?
- How would the sampling distribution change if we sampled without replacement?
- What is the difference between the population standard deviation and the standard deviation of the sample means?
Tip: When calculating the standard deviation of the distribution of sample means (standard error), remember it decreases as the sample size increases, providing a more accurate estimate of the population mean.
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Math Problem Analysis
Mathematical Concepts
Statistics
Sampling Distribution
Central Limit Theorem
Formulas
Standard Error of the Mean: σₓ̄ = σ / √n
Theorems
Central Limit Theorem
Suitable Grade Level
College Level
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