Math Problem Statement

A sample of size 37 will be drawn from a population with mean 45 and standard deviation 9. Is it appropriate to use the normal distribution to find probabilities for \(\bar{x}\)?

Solution

Yes, it is appropriate to use the normal distribution to find probabilities for the sample mean xˉ\bar{x} in this case.

Here's why: According to the Central Limit Theorem, if we draw a sample of size n30n \geq 30 from a population with any distribution, the sampling distribution of the sample mean xˉ\bar{x} will be approximately normal. Here, the sample size is 37, which is greater than 30, so we can assume that the distribution of the sample mean is approximately normal.

Would you like a more detailed explanation, or do you have any specific questions?


Here are 5 additional questions to deepen understanding:

  1. How does the Central Limit Theorem justify the use of a normal distribution for larger sample sizes?
  2. What would happen if the sample size were significantly smaller, say n=10n = 10?
  3. How do you calculate the standard error of the mean for a sample?
  4. Why is it useful to approximate the distribution of sample means as normal?
  5. What is the difference between the population distribution and the sampling distribution?

Tip: For sample sizes larger than 30, the Central Limit Theorem usually allows us to assume normality in the sampling distribution of the mean, making it easier to calculate probabilities and confidence intervals.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Sampling Distribution
Central Limit Theorem
Normal Distribution Approximation

Formulas

Standard Error of the Mean: \( \sigma_{\bar{x}} = \frac{\sigma}{\sqrt{n}} \)

Theorems

Central Limit Theorem

Suitable Grade Level

Undergraduate Statistics