Mathematics, 14.02.2020 03:08, sreeytran
A researcher wants to determine whether there is a relationship between age and the number of text messages sent in a given day. In a random sample of 18- to 25-year-old cell phone users, 100 of 125 users sent texts more often than they made phone calls. In a random sample of 26- to 35-year-old cell phone users, 75 of 120 sent texts more often than they made phone calls. What is the margin of error for a 99% confidence interval for the difference between the proportions of cell phone users in these age groups who text more often than they call?
a. 0.0032
b. 0.0569
c. 0.1114
d. 0.1465
e. 0.2864
Answers: 3
represent the real population proportion for brand 18-25 users
represent the estimated proportion for 18-25 users
is the sample size
represent the real population proportion for 26-35 users
represent the estimated proportion for 26-35 users
is the sample size required for Brand B
represent the critical value for the margin of error
and 
, with that value we can find the quantile required for the interval in the normal standard distribution.
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A researcher wants to determine whether there is a relationship between age and the number of text m...
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