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A group of investigators are interested in conducting a clinical trial to determine whether taking bio-identical treatments prevents postmenopausal osteoporosis in women. They obtained a list of physicians in the region and recruited their patients by mailing out response cards to all eligible women; 60% of the cards were returned and 75% of those respondents entered the study. They were equally divided into the treatment group and placebo group, and were followed for 5 years to determine if they develop osteoporosis. Identify the population, sample, sampling frame, and type of study.
How large a sample is necessary to estimate the proportion of interest to within 2% in a 95% confidence interval?
b. State the regression model equivalent to covariance model (22.3) for this case; use 1, -I, o indicator variables. Also state the reduced regression model for testing for treatment effects.
Determine critical path and project completion time. Determine the probability that the project will be finished in 70 days or less. Determine the probability that the project will be finished in 80 days or less
1. A coin having probability p of coming up heads is continually ?ipped. Let Pj(n) denote the probability that a run of j successive heads occurs within the ?rst n ?ips.
a an electrical noise voltage is shown to be gaussian with a mean of zero and a variance of 1 volts squared. what is
Suppose we wish to compute 95% Tukey simultaneous confidence intervals to compare the mean durability of the different paints. Use the MINITAB output to help you to calculate the margin of error for these intervals. DO NOT CALCULATE THE INTERVALS!
If "Some obsessive-compulsive behaviors are not curable diseases" is true, what is the truth value of the following statements?
Consider taking a random sample X1 , . . . , Xn from a normal with mean µ and variance sigma^2.
at parkview at any given time the probability that a randomly selected student is a female is 30. with this binomial
The running time for videos is normally distributed with mean 390 and standard deviation 148. suppose a sample of 40 videos are selected, what is the probability that the mean running time of the sample exceeds 360 seconds?
A study is conducted to test a new drug claimed to reduce diastolic blood pressure in adults with a history of coronary heart disease. What is the most efficient study to test whether the drug reduces diastolic blood pressure? Justify your answer.
since previous studies have reported that elite athletes are often deficient in their nutritional intake e.g. total
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