Answered: Social Networking Sites In a survey of…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Social Networking Sites

In a survey of 2255 randomly selected US adults (age 18 or older), 1787 of them use the Internet regularly. Of the Internet users, 1054 use a social networking site.⁷ Find and interpret a 95% confidence interval for each of the following proportions:

(a)

Proportion of US adults who use the Internet regularly.

(b)

Proportion of US adult Internet users who use a social networking site.

(c)

Proportion of all US adults who use a social networking site. Use the confidence interval to estimate whether it is plausible that 50% of all US adults use a social networking site.

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