Assume the heights of women are normally distributed with a mean of 67.5 inches and a standard deviation of 2.5 inches. If 25 women are randomly selected, find the probability that they have a mean height greàter than 68 inches. Draw a bell curve, label your mean and shade the area that you are trying to find. Then answer the question. (round to 4 decimal places) Before you solve the problem answer the following questions:
Assume the heights of women are normally distributed with a mean of 67.5 inches and a standard deviation of 2.5 inches. If 25 women are randomly selected, find the probability that they have a mean height greàter than 68 inches. Draw a bell curve, label your mean and shade the area that you are trying to find. Then answer the question. (round to 4 decimal places) Before you solve the problem answer the following questions:
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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Transcribed Image Text:**Educational Content: Understanding Probability with Normal Distribution**
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**Problem Statement:**
Assume the heights of women are normally distributed with a mean of 67.5 inches and a standard deviation of 2.5 inches. If 25 women are randomly selected, find the probability that they have a mean height greater than 68 inches. Draw a bell curve, label your mean, and shade the area that you are trying to find. Then answer the question. *(Round to 4 decimal places)*
**Steps to Solve:**
1. **Identify the Parameters**:
- Mean (\(\mu\)) = 67.5 inches
- Standard Deviation (\(\sigma\)) = 2.5 inches
- Sample size (n) = 25
- Sample mean to compare = 68 inches
2. **Calculate the Standard Error**:
- Standard Error (SE) = \(\frac{\sigma}{\sqrt{n}} = \frac{2.5}{\sqrt{25}} = \frac{2.5}{5} = 0.5\)
3. **Calculate the Z-score**:
- Z = \(\frac{X - \mu}{SE} = \frac{68 - 67.5}{0.5} = 1\)
4. **Find the Probability**:
- Use the standard normal distribution table or a calculator to find the probability corresponding to a Z-score of 1.
- Probability (P) = 1 - P(Z ≤ 1)
5. **Draw the Bell Curve**:
- A bell curve representing the normal distribution is drawn.
- The mean (\(\mu = 67.5\)) is marked in the center of the curve.
- The region to the right of 68 inches is shaded to represent the area for which you are finding the probability.
**Outcome:**
- Calculate the probability of selecting 25 women with a mean height greater than 68 inches based on the Z-score and standard normal distribution table.
- Ensure to round the probability to 4 decimal places as instructed.
**Questions for Understanding:**
- What is a normal distribution, and why is it important in statistics?
- How can the concept of standard error assist in understanding sample means?
- What is a Z-score, and how does it help in finding probabilities?
This exercise provides a practical application of the statistical concepts of normal distribution
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