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Suppose that an investigator considers conducting a case-control study to evaluate the relationship between invasive epithelial ovarian cancer and the history of infertility (yes/no). It is estimated that the proportion of controls with a history of infertility is about 10% and the investigator wishes to detect a relative risk of 2.0 with a power of 80% using a two- sided level of significance of 0.05.
(a) Find the total sample size needed if the two groups, cases and controls, are designed to have the same size.
(b) Find the total sample size needed if the investigator likes to have the number of controls four times the number of cases.
(c) Find the number of cases needed if the design is 1:1 matched; matching criteria are various menstrual characteristics, exogenous estrogen use, and prior pelvic surgeries.
If you draw two balls without replacing the first one, what is the possibility that one ball is red and the other is white.
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Chicken Delight claims that 90% of its orders are delivered within 10 minutes of the time the order is placed. A sample of 100 orders revealed that 82 were delivered within the promised time.
Based on p=.60, probability that a randomly selected homeowners will say no to newspaper subscription.
following a significant one-way between-subjects anova in which k gt 2 what is the next appropriate step?a summarize
A random sample obtained from a population has a mean of µ=100 and a standard deviation of σ = 20. The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean ..
consider the following bivariate data.point a b c d e f g h i jx 3 3 2 6 3 7 2 2 6 6y 7 1 5 6 3 7 5 7 2 5a construct a
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