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1.). The total cholesterol levels of a sample of men aged? 35-44 are normally distributed with a mean of 212 milligrams per deciliter and a standard deviation of 38.9 milligrams per deciliter.
?(a) What percent of the men have a total cholesterol level less than 225 milligrams per deciliter of? blood?
?(b) If 260 men in the? 35-44 age group are randomly? selected, about how many would you expect to have a total cholesterol level greater than 270
2.) Use the normal distribution of fish lengths for which the mean is 9 inches and the standard deviation is 4 inches. Assume the variable x is normally distributed.
(a) What percent of the fish are longer than 11 ?inches?
(b) If 500 fish are randomly? selected, about how many would you expect to be shorter than 6 ?inches?
a professor is interested in comparing the average amount spent on textbooks for freshmen and sophomores. a random
For testing H0; ? = 1 versus ? > 1, show that the problem is invariant under the group of transformations gc(x1, x2) = (cx1, cx2), c > 0
Based on the data provided, which of these funds has exhibited greater relative variability? Use the proper statistical measure to make your determination.
The gestation period for human births can be taken as normally distributed with a mean of 266 days and a standard deviation of 16 days.
This sample group has errors with a standard deviation of 54.7ft. At the 5% level of significance, test that the new population has errors with a standard deviation equal to 43.7ft.
Your hospital is negotiating with medical insurance providers, who would like to reduce the amount they pay as reimbursement for hospital stays.
A random survey of 75 death row inmates revealed that the mean length of time on death row is 17.4 years with a standard deviation of 6.3 years.
What is the new value for each of the scores from the original population?
What are the implications for building a requisite model of the current car-purchase decision if trading in the car is treated as an uncertain event? As a decision?
1. What is the estimated standard error for a sample of n = 25 scores with SD = 60?
Population and the sample proportion of grandparents as primary caregivers (-hat) is to be calculated. What is the mean of the sampling distribution of -hat?
Assume that x is a binomial random variable with n = 1000 and p = 0.80. Use a normal approximation to find P(800
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