Find the Z-scores that separate the middle 72% of the distribution from the area in the tails of the standard normal distribution. Click the icon to view a table of areas under the normal curve. Tables of areas unc The Z-scores are (Use a comma to separate answers as needed. Round to two decimal places as needed.)

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Author:Amos Gilat
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**Text Description:**

Title: Finding Z-scores for the Middle 72% of a Standard Normal Distribution

**Instructions:**
- Find the Z-scores that separate the middle 72% of the distribution from the area in the tails of the standard normal distribution.
- Click the icon to view a table of areas under the normal curve.

**Input Area:**
- The Z-scores are [________].
  *(Use a comma to separate answers as needed. Round to two decimal places as needed.)*

**Options:**
- Help me solve this
- View an example
- Get more help

**Table of Areas Under the Normal Curve:**

The table provides cumulative probabilities for the standard normal distribution:
- The rows and columns indicate the Z-values, and the body of the table shows the area to the left of a given Z-value under the normal curve.
- For example, to find the area for Z = 0.3, locate the row for 0.3 and the column for 0.00, and the intersecting value is the cumulative probability.

**Graph/Diagram Description:**

- The table is a standard Z-table, displaying cumulative probabilities for different Z-scores.
- The rows correspond to the first decimal of the Z-score, ranging from -0.0 to 3.4.
- The columns add additional precision, ranging from .00 to .09.
- Values inside the table represent the probability that a value is less than the corresponding Z-score.

*Note: Adjust the Z-scores as needed to find the correct values separating the middle 72% from the tails.*
Transcribed Image Text:**Text Description:** Title: Finding Z-scores for the Middle 72% of a Standard Normal Distribution **Instructions:** - Find the Z-scores that separate the middle 72% of the distribution from the area in the tails of the standard normal distribution. - Click the icon to view a table of areas under the normal curve. **Input Area:** - The Z-scores are [________]. *(Use a comma to separate answers as needed. Round to two decimal places as needed.)* **Options:** - Help me solve this - View an example - Get more help **Table of Areas Under the Normal Curve:** The table provides cumulative probabilities for the standard normal distribution: - The rows and columns indicate the Z-values, and the body of the table shows the area to the left of a given Z-value under the normal curve. - For example, to find the area for Z = 0.3, locate the row for 0.3 and the column for 0.00, and the intersecting value is the cumulative probability. **Graph/Diagram Description:** - The table is a standard Z-table, displaying cumulative probabilities for different Z-scores. - The rows correspond to the first decimal of the Z-score, ranging from -0.0 to 3.4. - The columns add additional precision, ranging from .00 to .09. - Values inside the table represent the probability that a value is less than the corresponding Z-score. *Note: Adjust the Z-scores as needed to find the correct values separating the middle 72% from the tails.*
### Understanding Z-Scores for the Normal Distribution

To find the Z-scores that separate the middle 72% of a standard normal distribution from the tails:

1. **Problem Statement:**
   - Determine the Z-scores that divide the middle 72% of the distribution from the two tails.
   - Use a standard normal distribution table and round your answers to two decimal places.

2. **Using the Table:**
   - Refer to the "Tables of areas under the normal curve" provided in the image.
   - This table helps find the area under the curve for different Z-score values.

3. **Diagram Explanation:**
   - The image includes a small bell curve showing the area in question (the 72% in the center).
   - The table (Table V) provides cumulative probabilities for Z-scores ranging from -3.4 to 3.4.

4. **How to Read the Table:**
   - The leftmost column lists Z-scores from -3.4 to 3.4.
   - The top row represents the decimal extension of the Z-scores (e.g., .00, .01, etc.).
   - Cross-referencing a Z-score and its decimal expansion gives the cumulative probability from the left tail.

5. **Steps to Solve:**
   - Identify cumulative probabilities corresponding to the lower and upper bounds of the middle 72%.
   - For the standard normal distribution, the total area is 1. The middle 72% means 0.72 is centrically distributed, leaving (1 - 0.72) / 2 = 0.14 in each tail.
   - Look for the Z-score where the cumulative probability is 0.14 for the lower Z and 0.86 (1 - 0.14) for the upper Z.

6. **Practical Application:**
   - These Z-scores define critical regions in hypothesis testing and set thresholds for statistical decision-making.

### Interactive Features:
- **Help Options:**
  - "Help me solve this" links to guided solutions.
  - "View an example" provides similar problems with solutions.
  - "Get more help" offers additional resources or explanations. 

- **Print and Done Buttons:**
  - These allow you to print the table or close the window once the task is complete. 

Use this framework to determine precise Z-scores for your statistical analysis needs, ensuring a comprehensive understanding of data distribution
Transcribed Image Text:### Understanding Z-Scores for the Normal Distribution To find the Z-scores that separate the middle 72% of a standard normal distribution from the tails: 1. **Problem Statement:** - Determine the Z-scores that divide the middle 72% of the distribution from the two tails. - Use a standard normal distribution table and round your answers to two decimal places. 2. **Using the Table:** - Refer to the "Tables of areas under the normal curve" provided in the image. - This table helps find the area under the curve for different Z-score values. 3. **Diagram Explanation:** - The image includes a small bell curve showing the area in question (the 72% in the center). - The table (Table V) provides cumulative probabilities for Z-scores ranging from -3.4 to 3.4. 4. **How to Read the Table:** - The leftmost column lists Z-scores from -3.4 to 3.4. - The top row represents the decimal extension of the Z-scores (e.g., .00, .01, etc.). - Cross-referencing a Z-score and its decimal expansion gives the cumulative probability from the left tail. 5. **Steps to Solve:** - Identify cumulative probabilities corresponding to the lower and upper bounds of the middle 72%. - For the standard normal distribution, the total area is 1. The middle 72% means 0.72 is centrically distributed, leaving (1 - 0.72) / 2 = 0.14 in each tail. - Look for the Z-score where the cumulative probability is 0.14 for the lower Z and 0.86 (1 - 0.14) for the upper Z. 6. **Practical Application:** - These Z-scores define critical regions in hypothesis testing and set thresholds for statistical decision-making. ### Interactive Features: - **Help Options:** - "Help me solve this" links to guided solutions. - "View an example" provides similar problems with solutions. - "Get more help" offers additional resources or explanations. - **Print and Done Buttons:** - These allow you to print the table or close the window once the task is complete. Use this framework to determine precise Z-scores for your statistical analysis needs, ensuring a comprehensive understanding of data distribution
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