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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.
Give an example of a hypothesis test you could perform at a Surgery Center and what the hypotheses would be. State the null and alternative hypotheses in proper format.
Your financial advisor sees this and tells you there is a 100% chance XYZ stock will gain over the 2-month period. Would you continue to use this financial advisor? Explain.
The mean output power is 42 watts, with a standard deviation of 8 watts Assuming a confidence level of 95%, which of the following statements do these data support?
How many business majors would be required to evaluate mean salary to within 10 with 95% confidence if population standard deviation is %200.
How much should they charge for a 2 year extended warranty so that they will still make money selling the extended warranties in the long run and keep the cost of the warranties as low as possible to make them more marketable?
The mean age of 25 randomly selected college seniors was found to be 23.5 years, and the standard deviation of all college seniors was 1.3 years. Which of the following is the correct symbol for 1.3 years?
Suppose that Y has a continuous distribution with pdf f2, let Z=X+Y. Show that Z has a continuous distribution and find its pdf.
Compute the 99% confidence interval for the proportion of clocks with errors in assembly and interpret this confidence interval.
a lottery commission offers four different lottery games to play three-number four-number five-number and five-number
1.a restaurant monitors its customers complaints. here are the percent of customers with the following complaintswith
Carry out an overall test to determine if there is significant evidence of a difference among A; B and C, at the significance level 1%.
historically the average time it takes jessica to swim the 200 meter butterfly is 148.4 seconds. jessica would like to
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