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A study compared the effectiveness of several antidepressants by examining the experiments in which they had passed the FDA requirements. Each of those experiments compared the active drug with a placebo, an inert pill given to some of the subjects. In each experiment some patients treated with the placebo had improved, a phenomenon called the placebo effect. Patients depression levels were evaluated on the Hamilton Depression Rating Scale, where larger numbers indicate greater improvement. The scatterplot at the top of the next column compares mean improvement levels for the antidepressants and placebos for several experiments.
a) Is it appropriate to calculate the correlation? Explain.
b) The correlation is 0.898. Explain what we have learned about the results of these experiments.
Standard deviation of the ages is 6 years. How large a sample should be taken so that the estimate is within 2 years of the population mean?
the purchasing department of major company has 100 employees 22 of whom have no children 50 of whom have exactly one
Find the sample mean, the sample median, and the sample mode for given table.
Compare and contrast the advantages and disadvantages of a few facilities versus a large number of facilities worldwide.
What does 95% payback mean in terms of the expected value of a play on the slot machines? i.e. What is the expected value of a pull on the slots?
Four different types of fertilizers are used on raspberry plants. The number of raspberries on each randomly selected plaint is given below.
Of course, many different kinds of plastic exist. Spend 10 minutes writing down pos- sible ways to recycle one-gallon plastic milk jugs. You can assume that the milk jugs are received rinsed out and reasonably clean, but not sterile. Look at your ..
What is the probability that a cereal would be high calorie, given that is low fiber? In other words, what is P (high calorie, given low fiber)?
a recent survey asked how many people they associatd with since they moved to chicago. the mean 6 and mode 1 16 of
find the mean median and mode for the set of scores in the following frequency distribution table. round to 1 decimal
Show that the variance of the weight is finite when the likelihood is bounded.- Compare the previous choice with choosing (θ|x) as the instrumental distribution when the likelihood is proportional to a density.
a random sample of 12 second-year university students enrolled in a business statistics course wasdrawn. at the courses
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