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Determine the mean and variance of the random variable.
f(x) = (64 / 21)( 1/4)x , x = 1,2,3
Round your answers to three decimal places (e.g. 98.765).
The mean is =
The variance is =
In a sample of 12 bank tellers at a local branch office, the 7 tellers who have completed the advanced training program offered by the bank have a lower average error rate in the processing of transactions than the remaining 5 tellers.
a random sample of n 35 observations from a quantitative population produced a mean x2.4 and a standard deviation
the capital asset pricing model is a financial model that assumes returns on a portfolio are normally distributed.
Of 900 consumers surveyed, 414 said they were very enthusiastic about a new home decor scheme. What is the 99% confidence interval for the population proportion?
What is the chance that the number who say "yes" in a properly drawn random sample of 500 will be smaller than 360?
There are three loan officers at Farmer National Bank. All decisions on mortgage loans are made by one of these officers. The president of the bank would like to be sure that the rejection rate is about the same for the three officers.
Kannon Camera has developed a new camera that it claims can take an average of more than 10 photographs per second. You decide to evaluate the company's claim. In summary, in this problem you are given:
translate the following statements into equivilant formal expressionsa. some things are not owned by anyone.b. some
Assume that the population proportions are to be estimated from the samples described. Find the margin of error and the 95% confidence interval.
For a sample of 138 independent observations from a normal distribution of unknown μ and variance σ 2 = 2.6, the sample mean is 52.3. What is the width of the 95% confidence interval for μ?
reasearchers for a manufacture of barometers reach each of 50 barameters at the same time each day. the mean of the
What size sample would be required to estimate the proportion of hospital referrals with a margin of error of 0.04 or less at 95% confidence?
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