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We are interested in the effects of soy additives to diets on the blood concentration of estradiol in premenopausal women. We have historical data on six subjects, each of whose estradiol concentration was measured at the same stage of the menstrual cycle over two consecutive cycles. On the log scale, the error variance is about .109. In our experiment, we will have a pretreatment measurement, followed by a treatment, followed by a posttreatment measurement. Our response is the difference (post - pre), so the variance of our response should be about .218. Half the women will receive the soy treatment, and the other half will receive a control treatment. How large should the sample size be if we want power .9 when testing at the .05 level for the alternative that the soy treatment raises the estradiol concentration 25% (about .22 log units)?
Explain what the standard error of the mean represents and does the sampling distribution of x look like a Normal distribution if n is 10?
the health department reports a 1 rate of the hiv virus for the at-risk population. under certain conditions a
prepare a 1400- to 1750-word paper addressing the following explain how internal and external factors affect the four
If there are 75 baskets of tomatoes available to be sold at the roadside stand at the beginning of a day, what is the probability that they will all be sold by the end of the day?
7% chance of making $40,000; a 20% chance of making $10,000; and 70% chance of making $0. How much should you be willing to pay for this deal?
a spymaster has a network of 7 operatives whom he pays out of a slush fund containing 20000. for accounting reasons his
An article in Annals of Mathematical Statistics reports the following data on the number of borers in each of 120 groups of borers. Does the Poisson pmf provide a plausible model for the distribution of the number of borers in a group?
The mean (m) number of employee absences in company X is 6 days annually, according to previous studies conducted by the Human Resources Department.
containers arrive at a stocking station on a conveyor at the rate of five per minute. container weight is 25 kg.
(a) Plot the quarterly number of tourists to Table Mountain for 2009 and 2010. (b) Calculate the de-seasonalised values for each quarter and plot on the same axis. Comment on the trend in the number of tourists visiting Table Mountain.
The average number of miles that 90 truckers drove in a day was 540.0 with a standard deviation of 40 miles. What is the 99% confidence interval of the true mean number of miles driven by all truckers?
Write the null and alternative hypotheses and calculate the test statistic, determine the critical value whether or not there has been an improvement.
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