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A clinical trial consists of testing two drugs (S & T) where patients take S on one occasion and T on a second occasion with enough time between occasions for recovery from drug effects. For each drug, the patient reports whether or not the drug was efficacious. From a random sample of 100 patients, we find that in 25 patients, Drug S exhibited effective action and Drug T did not. In 5 patients, Drug T was effective and Drug S was not. In 30 patients, both drugs yielded effective actions.
Using the normal distribution to approximate the answer give 95% confidence interval for the difference between the population proportions of effective actions in S versus T.
listed below are brain volumes in cm cubed of unrelated subjects used in a study. use a 0.01 significance level to test
Standard deviation of 2.5 minutes. What does Chebyshev's Theorem say about the percentage of employees with commuting times between 58.6 minutes and 68.6 minutes?
The loss random variable X has an exponential distribution with mean 1 and an ordinary deductible is applied to all losses.
Under what conditions can we assume that X is a binomial random variable?- Making the required assumptions, write the probability distribution of X.
If the coin shows heads, add one blue marble to your bag, and add a red marble on tails. Now choose a marble at random from your bag.
Can people really identify their favorite brand of cola? Volunteers tasted Coca-Cola Classic, Pepsi, Diet Coke, and Diet Pepsi, with the results shown below.
How much would you need to invest initially?
Assuming that the populations in Table 1 are normally distributed (allowing the use of the Z distribution) with equal population variances
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Your hospital wants to study patients readmitted within 30-days. What measures (e.g. Medicare patients only) would you recommend be included in the study (identify at least 3)? Where would you locate the data elements (e.g. admission records)?
Sports and Leisure Anyone who bets money in a casino is classified as a winner if he or she wins more than he or she loses. Casino operators in Atlantic City.
What is the difference between a stratified sample and a systematic sample
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