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Question: In a study done in Maryland, investigators surveyed individuals by telephone about how often they get tension headaches (Schwartz et al., 1998). 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 1600 women in the survey aged 18 to 29, a total of 653 said that they had experienced ETTHs in the last year. Of the 2122 women in the 30- to 39-year-old age group, the number having experienced episodic headaches was 995.
a. Calculate the proportion in each group who experienced an episodic headache in the prior year, and compute the difference in these two proportions.
b. Compute a 95% confidence interval for the difference between the proportions for these age groups in the population. Write a sentence that interprets this confidence interval.
question a psychologist is examining the educational advantages of a preschool program and suspects that there will be
Consider the system shown in Figure P9.27. Determine the maximum value of K = Kmax, for which the closed-loop system is stable. Plot the phase margin as a function of the gain 1 ≤ K ≤ Kmax. Explain what happens to the phase margin as K approaches Kma..
You can win $100 if you succeed in any one of the following: 1) draw a spade from a fresh deck of cards; 2) draw a heart from a fresh deck of cards; or 3) flip a fair coin and it comes up tails.
Suppose prior elections in Louisiana indicated it is necessary for a candidate for governor to receive at least 80 percent of the vote in the northern part of the state to be elected.
Dr. S wishes to measure the effect of TV viewing on reading scores in elementary school children. The data for the sample are shown here. Assume the population is normal.
Give an estimate of the difference in gender proportions that favored Commercial A. Also construct a large-sample 95% confidence interval for this difference.
Use the list of random digits below to assign 4 men and 2 women to the shark fin treatment. Read the table from left to right, first selecting the 4 men and then the 2 women. Use the numerical labels given in the chart to the names.
an elevator can carry up to 3500 pounds. the manufacturer has included a safety margin of 500 pounds and lists the
Find out the probability that: First electric brush chosen is defective?
You have money in an account at 7% interest, compounded monthly. To the nearest year, how long will it take for your money to triple?
the photoresist thickness in semiconductor manufacturing has a mean of 10 micrometers and a standard deviation of 1
you conducted a chi-square goodness of fit test in your asci 691 capstone project. unfortunately you did not get the
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