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Suppose that we generate a random sample from a given distribution. If it is desired that the probability that the sample mean will be within 2 standard deviations of the mean of the distribution is at least .99, how large should the sample size be?
These data are presented below. Should the manager be given an increase in staff? Why or why not? Please show your work.
According to a recent survey, 275 of 400 middle-aged Americans said they used the Internet regularly. 140 of 400 senior citizens said they used the Internet regularly.
Critically illustrate out the term standard deviation. Define mathematical averages. Why is the standard deviation less than the mathematical average?
Which of the following models are appropriate to forecast a time series whose amplitude increases over time?
The Duracells had an average lifetime of 18.67 hours (SD = 1.176 hours) while the Energizer batteries had an average lifetime of 16.83 hours (SD = 2.878 hours). Assuming the population standard deviations to be equal, what is the test statisitic a..
A random sample of 20 single men was asked if they would welcome a woman taking the initiative in asking for a date. What is the probability that:
A sample of 81 business managers on the West Coast had an average breakfast cost of $7.65. 13. At a = 0.05, what is the test value?
Given CAPM as the benchmark, is either of the two managers over-performing the market? What if you use the Sharpe Ratio as benchmark? Explain the answer carefully.
Calculate p value? What is the critical value?
At the 0.05 level of significance, is there sufficient reason to believe that the integers are not being generated uniformly?
A study 200 nurses found that of 125 females nurses, 56 had bachelor's degree; and of 75 male nurses; 34 had bachelor degrees. if a nurse is selected at random, find the probability that the nurse is a female nurse with a bachelor degree.
The sample information is reported below. At the .10 significance level can we conclude that there is a difference in the amounts quoted?
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