ew Hiiton Bookmarks Window Help edugen willeyplus com Help Statistics: Unlocking
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ew Hiiton Bookmarks Window Help edugen willeyplus com Help Statistics: Unlocking the Power of Data, 1st Edition, WileyPLUS Custom Course for Statistical Methods And Motivations University of Kentucky what proportion o Aduts and Teens rext Message? A study of n 2252 adults age 18 or older found that 726 of the cell phone users send and receive text messages. A study of n 800 teens age 12 to 17 found that 87i of the teen cell phone users send and receive text messages. What is the best estimate for the difference in the proportion of cel phone users who use text messages, between adults (defined as 18 and over) and teens? uenhart, A cel phones and American Adults' Pew Research centers Intermet and American ufe Project, accessed at http://pewinternet org/Reports/ 0'Cell-Phones-and-American-Adultsoverview.aspx. la Give the notation (as a drterence 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. 1 2 P P1 p2 The notation is Version 4.22.3 sExplanation / Answer
Answer to the question)
group I:
n1 = 2252
p1^ = 0.72
Group 2:
n2 = 800
p2^ = 0.87
.
Answer to part a)
The quantity we are trying to estimate is difference in proportions
the notation is : P1 - P2
Where P1 is population proportion of adults
and P2 is the population proporiton of teens
.
Answer to part b)
The quantity that gives the estimate is :
p1^ - p2^
where p1^ is sample proportion of adults group
p2^ is sample proporiton of teens group
.
Answer to part c)
The value of estimate is :
p1^-p2^ = 0.72 -0.87 = -0.15
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