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A researcher is estimating influence of treatment using sample selected from normally distributed population with mean of µ = 80 and standard deviation of σ = 20. Researcher expects 12 point treatment effect and plans to use two-tailed hypothesis test with u α = .05
a. Calculate the power of test if researcher uses a sample of n = 16 individuals.b. Calculate power of test if researcher uses sample of n = 25 individuals.
A survey of the residents of a new subdivision on why they happened to select that area in which to live. You also wish to secure some information about what they like and do not like about life in the subdivision.
Can the company claim that they are faster than the average utility?
Show that theta~ = u(X) is an unbiased estimator of theta, where u(0) = 1 and u(x) = 0 if x =1,2, ... Compare the MSEs of theta(hat) and theta~ for estimating theta = e^(-m) when m=1 and m=2
During the period of time that a local university takes phone-in registrations, calls come in at the rate of one every two minutes.
What is the 95% confidence interval for the standard deviation of birth weights at County General Hospital, if the standard deviation of the last 25 babies born there was 1.1 pounds.
Compute the mode, median and mean for the college students and compute the mode, median and mean for the parents' data
The Starbucks in the Bauer College of Business found that 24% of customers purchase more than one cup of coffee per day from their shop. If 180 customers are randomly selected one day, what is the probability that no less than 25% of them purchase..
What is the difference between hypothesis and theory? If there is a difference between the two, what comes first - hypothesis or theory?
Suppose that nine additional firms will be added to the bankruptcy rolls during the next quarter. How many of those failures are likely to be attribute to fraud?
Western residents reported that they were completely satisfied with their local telephone service. Find the 95% confidence interval for the difference in two proportions.
What variables will be included, and collection methods used to obtain data. What is the population, sampling method used and why it is the best. Plan for data: describe what you will do with data once you have it, include types of graphs used and..
If statistically significant, do you believe the difference is large enough to be significant? If so, to whom, and explain why? Is normality assumption fulfilled? Describe.
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