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The Department of Transportation reported Amtrak trains had a 78% on-time arrival record over the previous 12 months (USA Today, November 23, 1998). Assume that in 2001, a study found 330 of 400 Amtrak trains arrived on time. Does the sample indicate the Amtrak arrival rate has changed? Test at a 95% confidence interval. What is the Hypotheses and idicate what is the sample proportion. What is the P-value and, in turn, what is your conclusion? Accept Reject?
Recognize and describe potential threats (up to 3) to internal validity.
Based on this sample, is Moe correct in his assertion? Write up formal commentary of results of your test.
From the given probability distribution finite the mean and standard deviation.
At the .05 significance level, can we conclude that the guideline is still reasonable?
Distributed with a mean of 9.5 years and a standard deviation of 1.8 years. Find the replacement time that separates the top 18% from the bottom 82%.
If 37% of high school students said that they exercise regularly, find the probability that 5 randomly selected high school students will say that they exercise regularly.
The average number of television sets in the sample households turns out to be 1.86, and the SD is 0.86. Find a 95% confidence interval for the average number of television sets per household.
It was found that the correlation is about .80 and the regression equation is handspan = 3 + 0.35 height What is the predicted handspan for someone 5 feet tall?
A survey is planned to determine the mean annual family medical expenses of employees of a large company. The management of the company wishes to be 95% confident that the sample mean is correct to within plus-or-minus $50 of the population mean.
ssuming that the shipment includes 3% defectives, what is the probability that the shipment will be accepted? (Hint: Use the binomial distribution.)
If 15 golfers have checked in using this process, what is the expected number and standard deviation of no-shows among these golfers? (Show computations)
College graduates, and half of the college graduates are married. What is the probability that a randomly chosen worker is: Neither married nor a college graduate?
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