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IN a famous experiment to determine the efficacy of aspirin in preventing hear attacks, 22,000 healthy middle-aged men were randomly divided into two equal groups, one of which was given a daily dose of aspirin and the other a placebo that looked and tasted identical to the aspirin. The experiment was halted at a time when 104 men in the aspirin group and 189 in the control group had had heart attacks. use these data to test the hypothesis that the taking of aspirin does not change the probability of having a heart attack.
a) What percentage of the tires can be expected to last more than 40,000 miles?
Compute a 90% confidence interval for the population mean μ of home run percentages for all professional baseball players.
Evaluate an online version of a course. An online version of a traditional course is to be evaluated by randomly assigning students to either the online version
(a) What is the probability that this person is doing daily exercise? (b) What is the probability that this person is doing daily exercise if we know that this person is a male?
Plot the dopant concentration profile of a 20" long silicon rod grown by the float-zone technique using P as a dopant in a core doping scheme for various lengths of the floating zone.
If we decrease the level of significance a (alpha) from 0.05 to 0.01, that means we are: More willing to accept a type II error;
A company produces and sells four grades of industrial solvents - A, B, C, and D.The selling price per gallon of each grade of solventis $6.40, $5.00, $4.20, and $3.50 respectively.
You play twice. Assuming the plays are independent events, what are the mean and standard deviation of your total winnings?
In this paragraph, be sure to make it clear how you handled the issue of conducting three planned comparisons. Also provide the ANOVA summary table for these results.
In order to save costs, a firm issued a guideline that fax transmissions of 10 pages ormore should be sent by 2-day mail instead. Exceptions are allowed but they want theaverage to be 10 or below
Assume the random variable x is normally distributed with mean µ=85 and standard deviation s=55. Find the indicated probability. ?P(70
you play a dice game with two dice. if you roll at most 5 i.e. the sum of the two numbers is 2 3 4 or 5 then you win if
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