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Plasma-glucose levels are used to determine the presence of diabetes. Suppose the mean in (plasma glucose) concentration (mg/dL) in 35-44 year olds is 4.86 with standard deviation 0.54. A study of 100 sedentary people in this age group is planned to test if they have a higher or lower level of plasma glucose than the general population. A. If the expected difference is 0.10 in units, then what is the power of such a study if a two-sided test is to be used with α = .05? B. Answer the previous question if the expected difference is 0.20 in units. C. How many people would need to be studied to have 80% power under the assumptions in problem A?
Tthere is evidence that the two processes yield different average errors. Assume that the population standard deviations are equal. What is the null hypothesis?
Solve the problem: According to police sources a car with a certain protection system will be recovered 94% of the time. Find the probability that 4 of 8 stolen cars will be recovered.
How would you find the normal approximation to the binomial probability P(x = 5) in part A? Please show how you would calculate µ and σ in the formula for the normal approximation to the binomial, and show the final formula you would use without g..
Compute the median number of dependents?
Is the GPA of this year's students significantly different from the long-run average? At what alpha level would it be significant?
The following output is the result of running a linear regression on WEIGHT (y) = average weight in pounds for American females. Based on this regression model output, what will be the weight of a Russian Female who is 71 inches tall?
Biologist estimates that 50% of the deer in a region carry a certain type of tick. For a sample of 300 deer selected at random, what is the chance that 155 or fewer deer have this tick?
The last sample showed a mean and standard deviation of 3.55 and 0.08 inches, respectively. Using α = 0.05, the appropriate decision is?
The amount of money spent by a customer is uniformly distributed over (0,100). Find the mean and variance of the amount of money that the store takes on a given day.
The distribution is normal. The mean numbers of trials to learn maze for the group with the colrful wallpaper is 11. What is the standard deviation of the distribution of means?
With standard deviation of 15. Test hypothesis that Mrs. Smith and Mrs. Jones are equally effective teachers. Use 0.10 level of significance.
Twelve cases of leukemia are reported in people living in a particular census tract over a 5-year period. Is this number of cases abnormal if only 6.7 cases would be expected based on national cancer-incidence rates?
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