Answered: Give the value of the best estimate.

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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Chapter 3, Section 1, Exercise 028 - MathPad

What Proportion of Adults and Teens Text Message?

A study of n=2252 adults age 18 or older found that 72% of the cell phone users send and receive text messages.¹ A study of n=800 teens age 12 to 17 found that 87% of the teen cell phone users send and receive text messages. What is the best estimate for the difference in the proportion of cell phone users who use text messages, between adults (defined as 18 and over) and teens?

¹Lenhart, A.,"Cell Phones and American Adults," Pew Research Center's Internet and American Life Project, accessed at http://pewinternet.org/Reports/2010/Cell-Phones-and-American-Adults/Overview.aspx.

(a) Give the notation (as a difference with a minus sign) for the quantity we are trying to estimate.

Let group 1 be the adult cell phone users and let group 2 be the teen cell phone users.

p1-p2

p^1-p^2

μ1-μ2

x-1-x-2

ρ1-ρ2

r1-r2

(b) Give the notation for the quantity that gives the best estimate.

Let group 1 be the adult cell phone users and let group 2 be the teen cell phone users.

p1-p2

p^1-p^2

μ1-μ2

x-1-x-2

ρ1-ρ2

r1-r2

(c) Give the value of the best estimate.

Enter the exact answer.

The value of the best estimate is Enter your answer in accordance to the question statement.

exact number, no tolerance

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