A research program used a representative random sample of men and women to gauge the size of the personal network of older adults. Each adult in the sample was asked to "please name the people you have frequent contact with and who are also important to you." The responses of 2,822 adults in this sample yielded statistics on network size, that is, the mean number of people named per person was x = 14.3, with a standard deviation of s = 9.8. Complete parts a through d. a. Give a point estimate for µ. |(Type an integer or a decimal.) b. Give an interval estimate for u. Use a confidence coefficient of 0.95. ( ) (Round to two decimal places as needed.) c. Comment on the validity of the following statement: "95% of the time, the true mean number of people named per person will fall in the interval computed in part b." Choose the correct answer below. O A. The statement is correct. 95% of the time, the true mean number of people named per person will fall within an interval computed with a confidence coefficient of 0.95. B. The statement is incorrect. A correct statement would be "One can be 95% confident that the true mean number of people named per person will fall in the interval computed in part b." C. The statement is incorrect. A correct statement would be "95% of the time, the true mean number of people named per person will fall outside the interval computed in part b." D. The statement is incorrect. A correct statement would be "One can be 95% confident that the true mean number of people named per person will fall outside the interval computed in part b." d. It is unlikely that the personal network sizes of adults are normally distributed. In fact, it is likely that the distribution is highly skewed. If so, what impact, if any, does this have on the validity of inferences derived from the confidence interval? O A. It does not impact the validity of the interpretation because the sampling space of the sample mean is approximately normal according to the Central Limit Theorem. B. It does impact the validity of the interpretation because the interpretation was based upon a sample instead of the entire population. C. It does not impact the validity of the interpretation because the interpretation is based on highly skewed results. O D. It does impact the validity of the interpretation because the interpretation is based on highly skewed results.

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
icon
Related questions
Question
### Estimating the Size of Personal Networks in Older Adults

A research program used a representative random sample of men and women to gauge the size of the personal network of older adults. Each adult in the sample was asked to "please name the people you have frequent contact with and who are also important to you." The responses of 2,822 adults in this sample yielded statistics on network size, that is, the mean number of people named per person was \( \bar{x} = 14.3 \), with a standard deviation of \( s = 9.8 \). Complete parts a through d.

#### a. Give a point estimate for \( \mu \).

\[
\boxed{\text{(Type an integer or a decimal.)}}
\]

#### b. Give an interval estimate for \( \mu \). Use a confidence coefficient of 0.95.

\[
\left( \boxed{\phantom{00}}, \boxed{\phantom{00}} \right) \quad \text{(Round to two decimal places as needed.)}
\]

#### c. Comment on the validity of the following statement: "95% of the time, the true mean number of people named per person will fall in the interval computed in part b." Choose the correct answer below.

- ⃝ **A.** The statement is correct. 95% of the time, the true mean number of people named per person will fall within an interval computed with a confidence coefficient of 0.95.
- ⃝ **B.** The statement is incorrect. A correct statement would be "One can be 95% confident that the true mean number of people named per person will fall in the interval computed in part b."
- ⃝ **C.** The statement is incorrect. A correct statement would be "95% of the time, the true mean number of people named per person will fall outside the interval computed in part b."
- ⃝ **D.** The statement is incorrect. A correct statement would be "One can be 95% confident that the true mean number of people named per person will fall outside the interval computed in part b."

#### d. It is unlikely that the personal network sizes of adults are normally distributed. In fact, it is likely that the distribution is highly skewed. If so, what impact, if any, does this have on the validity of inferences derived from the confidence interval?

-
Transcribed Image Text:### Estimating the Size of Personal Networks in Older Adults A research program used a representative random sample of men and women to gauge the size of the personal network of older adults. Each adult in the sample was asked to "please name the people you have frequent contact with and who are also important to you." The responses of 2,822 adults in this sample yielded statistics on network size, that is, the mean number of people named per person was \( \bar{x} = 14.3 \), with a standard deviation of \( s = 9.8 \). Complete parts a through d. #### a. Give a point estimate for \( \mu \). \[ \boxed{\text{(Type an integer or a decimal.)}} \] #### b. Give an interval estimate for \( \mu \). Use a confidence coefficient of 0.95. \[ \left( \boxed{\phantom{00}}, \boxed{\phantom{00}} \right) \quad \text{(Round to two decimal places as needed.)} \] #### c. Comment on the validity of the following statement: "95% of the time, the true mean number of people named per person will fall in the interval computed in part b." Choose the correct answer below. - ⃝ **A.** The statement is correct. 95% of the time, the true mean number of people named per person will fall within an interval computed with a confidence coefficient of 0.95. - ⃝ **B.** The statement is incorrect. A correct statement would be "One can be 95% confident that the true mean number of people named per person will fall in the interval computed in part b." - ⃝ **C.** The statement is incorrect. A correct statement would be "95% of the time, the true mean number of people named per person will fall outside the interval computed in part b." - ⃝ **D.** The statement is incorrect. A correct statement would be "One can be 95% confident that the true mean number of people named per person will fall outside the interval computed in part b." #### d. It is unlikely that the personal network sizes of adults are normally distributed. In fact, it is likely that the distribution is highly skewed. If so, what impact, if any, does this have on the validity of inferences derived from the confidence interval? -
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps with 3 images

Blurred answer
Knowledge Booster
Point Estimation, Limit Theorems, Approximations, and Bounds
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc
Probability and Statistics for Engineering and th…
Probability and Statistics for Engineering and th…
Statistics
ISBN:
9781305251809
Author:
Jay L. Devore
Publisher:
Cengage Learning
Statistics for The Behavioral Sciences (MindTap C…
Statistics for The Behavioral Sciences (MindTap C…
Statistics
ISBN:
9781305504912
Author:
Frederick J Gravetter, Larry B. Wallnau
Publisher:
Cengage Learning
Elementary Statistics: Picturing the World (7th E…
Elementary Statistics: Picturing the World (7th E…
Statistics
ISBN:
9780134683416
Author:
Ron Larson, Betsy Farber
Publisher:
PEARSON
The Basic Practice of Statistics
The Basic Practice of Statistics
Statistics
ISBN:
9781319042578
Author:
David S. Moore, William I. Notz, Michael A. Fligner
Publisher:
W. H. Freeman
Introduction to the Practice of Statistics
Introduction to the Practice of Statistics
Statistics
ISBN:
9781319013387
Author:
David S. Moore, George P. McCabe, Bruce A. Craig
Publisher:
W. H. Freeman