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Multiple choice test has 50 questions each with 4 possible answers:
a) If Catherine guesses the answer to each question randomly, state the exact distribution of X,number of answers Catherine gets correct.
b) If the test has a pass mark of 20, find the probabilty that Catherine passes the test. using suitable approximation.
c) Shopna takes the same test, but knows enough to be able to rule out one of the possible answers to each question. Use a normal approximation to find the probability that Shopna fails the test.
What's the probability that a randomly chosen voter favors the death penalty?- What's the probability that a Republican favors the death penalty?
The U.S. Energy Information Administration reports the following prices for regular unleaded gasoline in Germany from 2003 through 2008. Source: U.S. Energy Information Administration, Annual Energy Review 2008, p. 321.
studies show that message therapy has a variety of health benefits a sample of 10 typical one-hour massage therapy
Enzyme immunoassay (EIA) tests are used to screen blood specimens for the presence of antibodies to HIV, the virus that causes AIDS. Antibodies indicate the presence of the virus.
1. the instructor in a humanities class says that students have a 15 probability of making an a in her class 20
a real estate investor is investigating whether the proportion of properties sold at auctions has declined from last
What is the margin of error of µ?? Interpret the results?
A random sample of 14 days shows Xbar = $502.95 and s = $64.00. You can assume normality. Using alpha = 4%, is the sampling result significant? Explain.
Use simulation with @RISK to determine the number of rooms that should be reserved to minimize the expected cost to the AMA.
Assume the probability that a person has the desease is 0.03 for all people, independently of each other, and compute the expected number of tests necessary for each group.
the following probability distributions of job satisfaction scores for a sample of information systems is senior
Using the six-step critical value approach, at the 0.05 level of significance, is there evidence that the population mean delivery time has been reduced below the previous population mean value of 25 minutes?
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