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Question: Suppose that you observe the following service times (in minutes) by a bank teller: 1, 2, 1, 7, 2, 4.
a. What is the mean service time?
b. What is the variance and standard deviation?
c. What is the coefficient of variation?
The sample mean talk time was 315 minutes with a standard deviation of 24 minutes. Why can we say that the sampling distribution of x is approximately normal?
What is the approximate probability that the mean diameter of the sample of 36 bearings will lie within 0.0001 inch of the population mean diameter of the bearings?
A much larger sample would be needed to estimate the proportion of the U.S. Army's 2.4 million active duty and reserve personnel who approved the repeal than would be needed to estimate the proportion of the Marine Corp's 200,000 personnel who fel..
The following data represent glucose blood levels(mg/100ml) after a 12 hour fast for random sample of 70 women: Employ 6 classes and make a frequency distribution table.
A normal random variable with a mean of $65.16 and a standard deviation of $10.00. What proportion of the households spent between $40.00 and $50.00.
Employee theft or poor inventory control and that employee theft and poor inventory control are equally likely? Use the .02 significance level.
What are significant predictors of CHD and what would a final model look like and can you provide an estimate of its predictive accuracy
A poll of 1,068 adult Americans reveals that 52% of the voters surveyed prefer the Democratic candidate for the presidency. At the 0.05 significance level, test the claim that more than half of all voters prefer the Democrat.
A manufacturing process produces items whose weights are basically distributed. It is known that 22.57% of all the items produced, weigh between 100 grams up to the mean and 49.18% weigh from the mean up to 190 grams.
What is the opportunity loss of spending 4 hours per week on average studying for the exam when the exam turns out to be easy?
Personal phone calls received by a new employee was 3,5, and 6. assume that samples of size 2 are randomly selected with replacement from this population of three values. Find the mean of the distribution.
The standard deviation is thought to be $400. How many card holders should be sampled? Your company charges a set dollar amount for each account in the sample.
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