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A clinical trial is being planned to investigate the effect of a new experimental drug designed to reduce total serum cholesterol. Investigators will enroll participants with total cholesterol levels between 200-240, they will be randomized to receive the new drug or a placebo and followed for 2 months, and the total cholesterol will be measured. Investigators plan to run a test of hypothesis and want 80% power to detect a difference of 10 points in mean total cholesterol levels between groups. They assume that 10% of the participants randomized will be lost over the 2 month follow-up. How many participants must be enrolled in the study? Assume that the standard deviation of total cholesterol is 18.5.
the following problem should be answered in rgenerate 50 normal distributions with mean 15 and standard deviation 3
68% it will rain tomorrow. What is the probability it will not rain tomorrow?
in a simple random sample of 80 automobiles registered in jland 28 of them were found to have emission levels that
The Minnesota Department of Transportation installed a state-of-the-art weigh-in-motion scale in the concrete surface of the eastbound lanes of Interstate 494 in Bloomington, Minnesota.
the number of incoming calls to a mail order call center is a poisson random variable with parameter of ?1.8min. what
Given an infinite population with a mean of 75 and a standard deviation of 12, the probability that the mean of a sample of 36 observations, taken at random from this population
Go to the Market Data section and then to Rates & Bonds, and you can click on a country to review its interest rates. Review the 1-year yields of currencies. Assume that you could invest at the quoted yield for each currency. Which currency would ..
An electro hydraulic actuator is used to actuate large loads for a robot manipulator, as shown in Figure DP9.5 [17]. The system is subjected to a step input, and we desire the steady-state error to be minimized. However, we wish to keep the overs..
jeff bollinger of prudential realtors has 20 residential listings under contract. the following table shows the number
prizes and the chances of winning in a sweepstakes are given in the table below.prizechances250000001 chance in
Can we conclude that more than 60% of retired people in the age group would return to work? I need to do a Hypothesis Testing using only P value format (Explain in everyday words but also have the formal steps show with results) on this problem.
Explain the difference between a left-tailed, two-tailed, and right-tailed test. When would we choose a two-tailed test? How can we tell the direction of the test by looking at a pair of hypothesis?
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