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Question: An experimenter wants to determine the relationship between weight change Y over a specified period and the use of a specially designed diet. The predictor variable X is a categorical variable indicating whether or not a person is on the diet. A total of 200 volunteers signed on for the study; a random selection of 100 of these were given the diet and the remaining 100 continued their usual diet.
(a) Record the experimental design.
(b) If the results of the study are to be applied to the population of all humans, what concerns do you have about how the study was conducted.
(c) It is felt that the amount of weight lost or gained also is dependent on the initial weight W of a participant. How would you propose that the experiment be altered to take this into account?
Describe a way in which the researchers could have conducted an experiment to examine the effectiveness of the cholera vaccine among people who are HIV-positive
Describe the pattern you see. How quickly did the proportion of heads settle down to the true probability?
If you are ask to minimize shipment cost, how much product should you ship from each Factoryto each Outlet.
an electronics store sells an average of 60 entertainment systems per month at an average of 800 more than the cost
The test results are shown below. At a = 0.05, can it be concluded that the book scores are higher than the DVD scores?
We are intersted in the number of students who prefer brand C cola. identify the distribution of the random variable and the mean,standard deviation.
Conditional probabilities of the indicators conditional on future profitability are P(G80,000) = .1; P(G 100,000) = .2; P(G120,000) = .6; P(G140,000) = .3. Should Dollar purchase that forecast?
IT appears that over the past 45 years, the number of farms in Australia declined while the average size of farms increased. The following data provided by the Australian Bureau of Agricultural and Resource Economics show five-year interval
what is your expected value for a game where your probability of winning is 16 and you profit is four times your
How would you ensure sufficient discussion of contentious issues in a work group? How can managers bring unspoken conflicts into the open without making them worse?
What is the possibility that for a arbitrarily selected customer the service time could exceed 3 minutes?
Does the data prove a significant difference in mean times?
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