Answered: In a study, investigators surveyed…

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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Question

In a study, investigators surveyed individuals by telephone about how often they get tension headaches. One response variable that was measured was whether or not the respondent had experienced an episodic tension-type headache (ETTH) in the prior year. A headache pattern was called "episodic" if the headaches occurred less often than 15 times a month; otherwise, the headaches were called "chronic." Of the 1,660 women in the survey aged 18 to 29, a total of 658 said that they had experienced ETTHs in the last year. Of the 2,172 women in the 30- to 39-year-old age group, the number having experienced episodic headaches was 996.

(a)

Calculate the proportion who experienced an episodic headache in the prior year in the 18 to 29 group. (Round your answer to four decimal places.)

Calculate the proportion who experienced an episodic headache in the prior year in the 30 to 39 group. (Round your answer to four decimal places.)

Compute the difference in these two proportions. (Use

p_{18 to 29} − p_{30 to 39}.

Round your answer to four decimal places.)

(b)

Compute a 95% confidence interval for the difference between the proportions for these age groups in the population (round to three decimals)

__to__

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