(c) Why are the results from parts (a) and (b) so close? O A. The results are close because the confidence 94% is close to 100%. B. The results are close because 0.48(1- 0.48) = 0.2496 is very close to 0.25. C. The results are close because the margin of error 2% is less than 5%.
(c) Why are the results from parts (a) and (b) so close? O A. The results are close because the confidence 94% is close to 100%. B. The results are close because 0.48(1- 0.48) = 0.2496 is very close to 0.25. C. The results are close because the margin of error 2% is less than 5%.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
Answer Part C Only!!
![A television sports commentator wants to estimate the proportion of citizens who "follow professional football." Complete parts (a) through (c).
**Links to Standard Normal Distribution Tables:**
- Click here to view the standard normal distribution table (page 1).
- Click here to view the standard normal distribution table (page 2).
---
**(a)** What sample size should be obtained if he wants to be within 2 percentage points with 94% confidence if he uses an estimate of 48% obtained from a poll?
The sample size is **2206**. (Round up to the nearest integer.)
**(b)** What sample size should be obtained if he wants to be within 2 percentage points with 94% confidence if he does not use any prior estimates?
The sample size is **2211**. (Round up to the nearest integer.)
**(c)** Why are the results from parts (a) and (b) so close?
- **A.** The results are close because the confidence 94% is close to 100%.
- **B.** The results are close because 0.48(1 − 0.48) = 0.2496 is very close to 0.25.
- **C.** The results are close because the margin of error 2% is less than 5%.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb3687cbc-fe37-486e-87e6-a5fec1076243%2F2ebb5dd8-fc7d-4512-9daf-e15d570b76a2%2Fpanixqi_processed.png&w=3840&q=75)
Transcribed Image Text:A television sports commentator wants to estimate the proportion of citizens who "follow professional football." Complete parts (a) through (c).
**Links to Standard Normal Distribution Tables:**
- Click here to view the standard normal distribution table (page 1).
- Click here to view the standard normal distribution table (page 2).
---
**(a)** What sample size should be obtained if he wants to be within 2 percentage points with 94% confidence if he uses an estimate of 48% obtained from a poll?
The sample size is **2206**. (Round up to the nearest integer.)
**(b)** What sample size should be obtained if he wants to be within 2 percentage points with 94% confidence if he does not use any prior estimates?
The sample size is **2211**. (Round up to the nearest integer.)
**(c)** Why are the results from parts (a) and (b) so close?
- **A.** The results are close because the confidence 94% is close to 100%.
- **B.** The results are close because 0.48(1 − 0.48) = 0.2496 is very close to 0.25.
- **C.** The results are close because the margin of error 2% is less than 5%.
![# Standard Normal Distribution Table
## Page 1
### Graph Explanation
The graph presented at the top of the page is a standard normal distribution curve, which is bell-shaped and symmetrical around the mean (zero). The shaded area represents the probability to the left of the given z-value. The vertical line intercepting the x-axis indicates a specific z-value, z, on the distribution.
### Standard Normal Distribution Table
The table lists z-values ranging from -3.4 to -0.1 along the leftmost column. The upper row of the table indicates the decimal value (0.00 to 0.09) to add to the z-value from the leftmost column. The intersection of a row z-value and a column decimal value provides the proportion of the standard normal distribution curve to the left of that combined z-value. For example:
- z = -3.4, additional 0.00: Probability = 0.0003
- z = -2.5, additional 0.06: Probability = 0.0062
## Page 2
### Graph Explanation
Similar to page 1, this graph shows another view of the standard normal distribution, emphasizing the shaded area (probability) to the left of a given z-value, z.
### Standard Normal Distribution Table
The table continues from where page 1 ends, listing z-values ranging from 0.0 to 2.9. The leftmost column contains these z-values, and the top row represents the decimal additions (0.00 to 0.09). The table cells give the cumulative probability from the left up to the specified z-value. For example:
- z = 0.0, additional 0.02: Probability = 0.5080
- z = 1.7, additional 0.04: Probability = 0.9582
This table is crucial for statistical calculations, often used to find probabilities and percentiles in a normal distribution.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb3687cbc-fe37-486e-87e6-a5fec1076243%2F2ebb5dd8-fc7d-4512-9daf-e15d570b76a2%2Fdj8k57f_processed.png&w=3840&q=75)
Transcribed Image Text:# Standard Normal Distribution Table
## Page 1
### Graph Explanation
The graph presented at the top of the page is a standard normal distribution curve, which is bell-shaped and symmetrical around the mean (zero). The shaded area represents the probability to the left of the given z-value. The vertical line intercepting the x-axis indicates a specific z-value, z, on the distribution.
### Standard Normal Distribution Table
The table lists z-values ranging from -3.4 to -0.1 along the leftmost column. The upper row of the table indicates the decimal value (0.00 to 0.09) to add to the z-value from the leftmost column. The intersection of a row z-value and a column decimal value provides the proportion of the standard normal distribution curve to the left of that combined z-value. For example:
- z = -3.4, additional 0.00: Probability = 0.0003
- z = -2.5, additional 0.06: Probability = 0.0062
## Page 2
### Graph Explanation
Similar to page 1, this graph shows another view of the standard normal distribution, emphasizing the shaded area (probability) to the left of a given z-value, z.
### Standard Normal Distribution Table
The table continues from where page 1 ends, listing z-values ranging from 0.0 to 2.9. The leftmost column contains these z-values, and the top row represents the decimal additions (0.00 to 0.09). The table cells give the cumulative probability from the left up to the specified z-value. For example:
- z = 0.0, additional 0.02: Probability = 0.5080
- z = 1.7, additional 0.04: Probability = 0.9582
This table is crucial for statistical calculations, often used to find probabilities and percentiles in a normal distribution.
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