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The average height of a male soldier is 70 inches with a standard deviation of 4 inches. The average height of female soldier is 66 inches with a standard deviation of 4 inches. If a male soldier and female soldier are paired up what will be the mean and standard deviation for the difference in heights for each possible pair?
Samples of size 49 are taken from a population with a σ of 17. If the mean of the sample is 25, what is the confidence interval at the 90% confidence level
A random sample of 15 paired observations has a correlation of -.46. Can we conclude that the correlation in the population is less than zero? Use the .05 significance level.
Suppose that the conclusion from an ANOVA is that the null hypothesis is rejected, in other words that the 6 population means are not all equal. What should we expect?
A new machine has just been installed to cut and rough-shape large slugs. The slugs are then transferred to a precision grinder. One of the critical measurements is the outside diameter.
For which of the following situations is it appropriate to use a scatter diagram or scatter plot?
The scheduled commuting time on the Long Island Rail Road from Glen Cove to New York City is 65 minutes. Suppose that the actual commuting time is uniformly distributed between 64 and 74 minutes.
Can you conclude that there is a higher proportion of U.S. companies offering high-deductible health insurance plans to their workers in 2006 than in 2005?
How large a sample should you take if you want to be 95% confident of the results and you want the error of the confidence interval to be no more than .05?
In a test of the independence of two variables, one of the variables has two possible categories and the other has three possible categories.
A person has purchased 5 of 1,000 tickets sold in a certain raffle. To determine the 10 prizewinners, 10 tickets are drawn at random and without replacement. compute the probability that he wins at least one prize.
She has a history of being successful at getting a donor on 55 percent of her calls. If June has a quota to get at least four donors each day.
What is the probability that the sample will have between 50% and 60% of the identifications correct? What is the probability that the sample percentage of correct identifications is greater than 65%?
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