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The population of employees in a certain large office building has weights distributed around a mean of 150 pounds, with a standard deviation of 20 pounds. A random group of 25 employees get in the elevator each morning. Find the mean and variance of:
(a) The total weight S.
(b) The average weight I. -
What is the difference between a one-tail and a two-tail test? How do we identify each? What is meant by a p-value?
Number of days of accrued annual leave. suppose that the mean and variance are 12 and 144, respectively. What is the probability that a sample of size 100 will yield a mean greater than 9?
question within the first six months of the new advertising campaign mccain was able to double its sales goal of a 15
suppose x has a poision distribution with a mean of .4. determine the following probabilitiesa
Suppose you are a pollster and are planning to take a sample that is very small relative to the population. In terms of estimating a population mean.
A random sample of 20 shipments gives x‾ = 2.6 days and s = 0.4 day. Give a 99% confidence interval for the average transit time.
question suppose a test for a certain disease is given to mike. the probability of a positive test result is .98 if
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.
A man fires 8 shots at a target. Assume that the shots are independent, and each shot hits the bull's eye with probability 0.7.
the decomposition approach to forecasting may be helpful when attempting to forecast a time-series. could an analogous
Suppose you want to estimate the proportion of traditional college students on your campus who own their own car. You have no preconceived idea of what that proportion might be.
An observation was drawn from a normally distributed population with mean 2.397 and standard deviation 0.612. If the observed value is 3.144, find the z-score. Give your answer accurate to 3 decimal places.
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