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The May 1, 2007, College Retirement Equity Fund (CREF) prospectus lists the following sample returns on $1 invested in two of the fund's accounts, per year.5
Equity Index Account ($): 1.636, 1.441, 0.973, 1.055, 1.400
Money Market Account ($): 1.169, 1.273, 0.976, 0.998, 0.953
Assuming these data are random samples, is there statistical evidence that one account is better than the other?
suppose 1568 of 2033 registered voters sampled said they planned to vote for the republican candidate for president.
How many companies respond that taxes are too high are public companies?
Flu cases this past fly season in the Central City school system were about 15 per week. For the entire state, the weekly average is 16 and the standard deviation, 2.35. Are the kids in Central City as sick as the kids throughout the state?
q1. assuming that the data are normally distributed with a mean of 25 and a standard deviation of 1.25 what is the
describe how to determine if a hypothesis test is one-tailed or two-tailed and explain how you know where to shade the
Let {Xn : n >=1} be a sequence of positive independent random variables with E(Xn) = c 2 (0; 1) for each n. Let Yn = X1X2...Xn, the product of the Xi's. Use Markov's inequality to prove that Yn ~ 0 in probability.
The rate of neurotoxicity over the period of the trial is estimated to be about 40% in the placebo group, and the hypothesis is that this new agent lowers the toxicity rate by one-half, to 20%. Find the total sample size needed using a two-sided l..
a researcher has developed a new drug designed to reduce blood pressure. in an experiment 21 subjects were assigned
Computing the probability value using normal distribution - find the normal distribution
The random variable x is the number of houses sold by a realtor in a single month at the Sendsom's Real Estate office. Its probability distribution is as follows.
the employees of cartwright manufacturing are awarded efficiency ratings. the distribution of the ratings approximates
Construct a 99% confidence interval for the true average amount of time customers spent in the restaurant. With a .99 probability, how large of a sample would have to be taken to provide a margin of error of 2.5 minutes or less?
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