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Question: 1. Use a random number generator from a statistical computer package to assign 20 patients to two treatments, with 10 patients receiving each treatment.
2. An investigator wishes to take a sample of 160 undergraduate students from a university to assess the attitudes of undergraduates concerning the student health service. The investigator suspects that the attitudes may be different for freshmen, sophmores, juniors, and seniors since it is thought that the attitudes might change as the students get more experience with the system. The investigator would like to make estimates for each class as well as the total body of undergraduates. Choose a method of sampling and give the reasons for your choice.
Hint: Given any x ∈ X , let U be a neighborhood of x with compact closure. Show that there is a continuous real function f on X ,0 at x , and 1 on X \U . Use this function to show that x is not in the closure of K \U .
Is there any evidence the completion time variance is different from the intended variance? Use a = 0.05 and assume the underlying distribution is normal.
Two production facilities at Denver and Atlanta. Components from these are shipped to warehouses. Production Capacities at each: 600 units at Denver and 400 units at Atlanta
Air enters a household electric furnace at 75°F, 1 atm, with a volumetric flow rate of 800 ft3/min. The furnace delivers air at 120°F, 1 atm to a duct system with three branches consisting of two 6-in.-diameter ducts and a 12-in.
in a recent survey of 102 wmu graduates 36 students said that parking was too limited on campus. what is the estimate
The registrar at Whitworth College has been asked to prepare a report about the graduate students. Among other things, she wants to analyze the ages.
How many months must be sampled for analysis to be 99% confidence that the error in estimating the average monthly price of gasoline is at most $0.03.
What is meant by autocorrelation and draw a figure showing positive and negative first- order autocorrelation.
A marketing manager wishes to estimate the proportion of customers who prefer a new packaging of a product to the old. He guesses that 60% of the customers.
Assuming that the difference of each pair is coming from an approximately normal distribu- tion, test if there is any difference in the individuals' driving ability under the two conditions. Use α = 0.05.
It is often stated in three-shift manufacturing organizations that the quality of work on the second shift is worse than on the first, and that the quality of work on the third shift is worst of all. How would you go about testing that premise?
A box contains 9 tickets numbered 1 to 9 inclusive. If 3 tickets are drawn from a box one at a time, find the probability that they are alternative after (1) odd, even, odd or (2) even, odd, even.
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