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Question: A medical researcher wants to estimate the difference in the proportions of women with high blood pressure for women who use oral contraceptives versus women who do not use oral contraceptives. In an observational study involving a sample of 900 women, the researcher finds that .15 (15%) of the 500 women who used oral contraceptives had high blood pressure, whereas only .10 (10%) of the 400 women who did not use oral contraceptives had high blood pressure.
a. What is the research question of interest for this study?
b. What is the population parameter in this study? What is the appropriate statistical notation for this parameter?
c. What is the value of the sample estimate (statistic) in this study? What is the appropriate statistical notation for this estimate?
Potato chips. The weight of potato chips in a mediumsize bag is stated to be 10 ounces. The amount that the packaging machine puts in these bags is believed.
Assume that cars are independent regarding to their paint quality. Each car has a 90% chance of passing the test. What is the probability that 3 of the next 6 cars will fail the test?
Consider the use of an op amp with a unity-gain frequency ft in the realization of: (a) An inverting amplifier with dc gain of magnitude K.
a random sample of 49 statistics examinations was taken. the average score in the sample was 84 with a variance of
The marketing team of a major electronics retailer is interested in running a promotion in the Westchester, NY area. This program provides incentives.
How many different benefit packages can an employee select? List them.- If all benefit packages are equally likely, what is the probability that an employee selects a package that includes health insurance?
Find the first order statistics at time instance 3. Find the probability at time instance k,the person is at the location m steps to the right of the origin.
To have 95% confidence that the sample percentage will be within 3 percentage points of the actual population percentage, how large a simple random sample is required?
Compute a 95% confidence interval for the difference between the recall proportions for the two populations.
Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time.
If a census division contains a large state, how will the monthly benchmark adjustment affect other states in the division?
To test the difference between two means using two mean z test.
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