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Question: A report in a medical journal notes that the risk of developing Alzheimer's disease among subjects who regularly opted to take the drug ibuprofen was about half the risk among those who did not. Is this good evidence that ibuprofen is effective in preventing Alzheimer's disease?
(a) Yes, because the study was a randomized, comparative experiment.
(b) No, because the effect of ibuprofen is confounded with the placebo effect.
(c) Yes, because the results were published in a reputable professional journal.
(d) No, because this is an observational study. An experiment would be needed to confirm (or not confirm) the observed effect.
(e) Yes, because a 50% reduction can't happen just by chance.
a how many ways are there to distribute seven identical apples and six identical pears to three distinct people such
a. Does the data indicate a significant difference between the treatments at the .05 level of significance?
Student who scores in the top 5% of statewide scores. How high should a student score be to win this award? Give your answer to the nearest integer.
The sensitivity of a test is the probability that a person having the disease will test positive (indicating the person has the disease, i.e., it's the probability the test will pick up the fact that a person has the disease).
The cost of a board failure and interruption includes the fixed cost c0 of a new board and a cost that increases proportionally to Y2. If C is the cost incurred, C = c0 + c1Y 2. Find the probability that the delivery time exceeds two days.
in a clinical trial of a drug used to help subjects stop smoking 812 subjects were treated with 1 mg doses of the drug.
What type of solution do you get for a quadratic equation where D
Talking and sex. Pastizzo and Carbone (2007) reviewed 152 transcripts of lectures, meetings, advisement sessions, public addresses, and other public records.
Let m denote a natural number. Use any properties of the natural numbers to argue that m x m is not equal to m + m.
Let x be N(µ,σ2 ) and consider the transformation x=log(y) or equivalently y=exp(x). Find the mean and the variance of y by first determining E(exp(x)) and E[(exp(x)^2 ], by using the moment generating function of x.
Jamal has just left home and must attend an important meeting with the CEO in just 25.0 minutes. If the CEO routinely fires employees who are tardy, what is the probability that Jamal will be going to work tomorrow?
Computation of Expectation, Variance and Covariance.Calculate the variances of Y1 and Y2.
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