View PoliciesCurrent Attempt in ProgressSocial Networking SitesIn a survey of 2255 randomly selected US adults (age 18 or older), 1787 of them use the Internet regularly. Of the Internet users, 1054use a social networking site.' Find a 99% confidence interval for each of the following proportions.Hampton, K., Goulet, L., Rainie, L., and Purcell, K., "Social Networking Sites and Our Lives," Pew Research Center, June 16, 2011.(a) Proportion of US adults who use the Internet regularly.Round your answers to three decimal places.toThe 99% confidence interval iseTextbook and MediaHint(b) Proportion of US adult Internet users who use a social networking site69°F CloudyWch

It is given that n=2255 and x=1787.

Answered: Ina survey of 2255 randomly selected US…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

In a study of speed dating, male subjects were asked to rate the attractiveness of their female dates, and a sample of the results is listed below (1 = not attractive; 10 = extremely attractive). Construct a confidence interval using a 90% confidence level. What do the results tell about the mean attractiveness ratings of the population of all adult females?7,7,1,8,6,5,8,8,8,8,5,9 What is the confidence interval for the population mean u? __<u<__ (Round to one decimal place as needed.)
1. Listed below is the moisture content (by percent) for random samples of different fruits and vegetables. Fruits: 92, 81, 78, 94, 93, 85, 98, 90. Vegetables: 91, 97, 94, 95, 101, 102, 98, 101, 100. a. Compute descriptive statistics that will help you do exploratory analysis on moisture content (fruits and vegetables) and comment on your results. b. Construct a 95% confidence interval for the difference in the average of moisture content (fruits and vegetables) assuming the variances are significantly different. c. Is there sufficient evidence to suggest that the moisture content in Fruit is different from the moisture content in vegetables? Assuming the variance are not significantly different. Use α=0.05. Use P –value in making your decision.
19.
A certain test preparation course is designed to help students improve their scores on the USMLE exam. A mock exam is given at the beginning and end of the course to determine the effectiveness of the course. The following measurements are the net change in 66 students' scores on the exam after completing the course: 10,18,15,14,4,1410,18,15,14,4,14 Using these data, construct a 80%80% confidence interval for the average net change in a student's score after completing the course. Assume the population is approximately normal. Copy Data Step 1 of 4: Calculate the sample mean for the given sample data. Round your answer to one decimal places
In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mauled to 2652 subjects randomly selected from an online group involved with ears. 1145 surveys were returned. Construct a 95% confidence interval for the proportion of returned surveys.
(3) If a retailer would like to estimate the proportion of their customers who bought an item after viewing their website on a certain day with a 90% confidence level and 3% margin of error, how many customers do they have to monitor?
A certain test preparation course is designed to help students improve their scores on the GMAT exam. A mock exam is given at the beginning and end of the course to determine the effectiveness of the course. The following measurements are the net change in 77 students' scores on the exam after completing the course: 20,18,2,4,15,15,1020,18,2,4,15,15,10 Using these data, construct a 80% confidence interval for the average net change in a student's score after completing the course. Assume the population is approximately normal
8. In late 2020, a poll was conducted to determine the proportion of American adults that subscribed to a TV or movie streaming service since January 2020. The surveyors randomly selected 2200 American adults. The results are shown in the relative frequency table below. Response Frequency Subscribed to at least one 794 Did not subscribe to a new one 1406 Given this information, we want to create a 95% confidence interval to estimate the proportion of American adults that subscribed to a TV or movie streaming service since January 2020. a. What is the value of the point estimate for our 95% confidence interval? b. What is the margin of error for our 95% confidence interval? (Use the formula to compute it). Round your answer to three decimal places. C. Using your answers to parts (a) and (b), find a 95% confidence interval estimating the proportion of American adults that subscribed to a TV or movie streaming service since January 2020.
In a survey of 813 human resource professionals concerning challenges they faced in the workplace, 321 said that employee retention was an important challenge and 194 said that employee satisfaction was an important challenge. the 95% confidence interval estimate for the population proportion is
A lawyer researched the average number of years served by 45 different justices on the Supreme Court. The average number of years served was 13.8 years with a standard deviation of 7.3 years. What is the 95% confidence interval for the average number of years served by all Supreme Court justices? Question 6 options: 1) (11.7,15.9) 2) (11.8,15.8) 3) (12.9,16.9) 4) (12.5,17.3)
9.
11.

Recommended textbooks for you

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

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

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

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

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

Elementary Statistics: Picturing the World (7th E…

Statistics

ISBN:

9780134683416

Author:

Ron Larson, Betsy Farber

Publisher:

PEARSON

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

Statistics

ISBN:

9781319013387

Author:

David S. Moore, George P. McCabe, Bruce A. Craig

Publisher:

W. H. Freeman

SEE MORE TEXTBOOKS