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1. What is the difference between a randomized experiment and a random sample?
2. A number of volunteers were randomly assigned to one of two groups, one of which received daily doses of vitamin C and one of which received daily placebos (without any active ingredient). It was found that the rate of colds was lower in the vitamin C group than in the placebo group. It became evident, however, that many of the subjects in the vitamin C group correctly guessed that they were receiving vitamin C rather than placebo, because of the taste. Can it still be said that the difference in treatments is what caused the difference in cold rates?
What are the expexted value and standard deviation, respectively, of the number of successful first serves? What is the probability she makes 90 or more successful first serves?
Suppose x follows a distribution with density function: f(x)=C*abs(x-2), 0 =
Find the probability that among 8 randomly selected graduates, at least one finds a job in his or her chosen field within a year of graduating.
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?
the teacher ratio is 125. currently the school district has 3150 students. if the student enrollment increases by 20
What sample size would be needed to estimate the proportion of male red > green color blindness if we wanted 96% confidence that the sample proportion is in error by no more than 0.03?
How large of a sample should be studied if the standard deviation from a previous study was 26 cents and he wants his estimate to be accurate to within 15 cents?
You obtain the data shown below for 30 girls with anorexia who were treated with psychodynamic therapy. Using the data below and the data above compare the outcomes for CBT and psychodynamic therapy.
a researcher uses analysis of variance to test for mean differences among four treatments with a sample of n 8 in each
the body mass index bmi of an individual is one measure that is used to judge whether an individual is overweight or
Discuss the strategic importance of forecasting. What strategic decisions do organizations need to make in terms of forecasting? What are some examples?
Suppose the average value of P is $ 3 and average value of Po is $ 6. Determine the price elasticity at average values of P and Po?
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