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Want a sample size of about 60 (30 controls and 30 cases). At 5% significance and 80% power.How do i determine the standard deviation and mean difference.And how do i arrive at the 60? my study design is case-control.
Given that the landowner pays for the soundings test and the test indicates that gas is present, what is the landowner's revised estimate of the probability of finding gas in this site?
Random sample of workers at each of three plants. Research question: Are the mean hourly productivity levels the same for workers in these three plants?
Analyze these data and summarize your findings for managers. Explain how information can be used by decision makers. Assume that sales per customer are normally distributed.
A genetic experiment with peas resulted in one sample of offspring that consisted of 438 green peas and 159 yellow peas.
Kannon Camera has developed a new camera that it claims can take an average of more than 10 photographs per second. You decide to evaluate the company's claim.
Exponential distribution with a mean of 4 minutes. What is the probability that a person is served in less than 3 minutes on at least 4 of the next 6 days.
Your performance as a principal depends on how well your entire group of eight-graders scores on the exam. What is the likelihood that your group of 115 eighth-graders will have an average score below 580?
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that
Construct a confidence interval for the population proportion p, given n = 182, x = 135; 95%. Suppose the random variable X has a normal distribution with mean 9.0 and variance 49. The probability that X takes on a value of at least 18 is approxim..
Mean of 3 goals per game. Find the probability that each of four randomly selected state college hockey games resulted in 6 goals being scored.
A researcher expects the population proportion of the Cubs Fans in Chicago to be 80%. Error of less than 5% confident of an estimate to be made from a mail survey. What is the sample size required?
What is the probability that more than 585 of this year's entering class of 1807 will drop out during or at the end of their first year?
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