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Question: SAT essay-is longer better? Following the debut of the new SAT Writing test in March 2005, Dr. Les Perelman from the Massachusetts Institute of Technology recorded the number of words and score for each essay in a sample provided by the College Board. A least-squares regression analysis
was performed on these data. The two graphs at bottom left display the results of that analysis. Explain why the conditions for performing inference are not met in this setting.
Hallmark would like to test the hypothesis that those celebrating Valentine's Day will spend more than an average of $125 on gifts. A random sample of 18 people celebrating Valentine's Day spent an average of $148.50 with a standard deviation of $..
Compute the sample mean weight for each sample. Given your conclusion in part (a), which pair(s) of population means do you think are different?
In a random sample of 120 cheerleaders, 54 had suffered moderate to severe damage to their voices. With 90% confidence, what can we say about the maximum error if we use the sample proportion 54/120 = 0.45 as an estimate of the true proportion of ..
The National Park Service has started charging a user fee to park at selected trailheads and crosscountry ski lots. Some users object to this fee, claiming they already pay taxes for these areas. The agency has decided to randomly question selecte..
What is the formula for the weighted average score for alternative j when using a multi-criteria scoring model?
The director of Heating and Oil at Superior Oil Company is concerned about the high cost of home heating oil being offered to their customers for the upcoming Fall season in Philadelphia, PA.
an insurance company has 10000 automobile policyholders. the expected yearly claim per policy holder is 240 with a
Caption: As you prepared your memo about the new "Tire Kit" line, you discovered that the sample size that you were provided was insufficiently small. Using a larger sample of 200 customers, you conducted this research and the data is now ready fo..
In problem, suppose the confidence interval contained the value 0.00. How could the banker's attorney use this information to defend his client?
Because patients had to consent to participate in this experiment, the subjects were essentially selfselected a kind of voluntary response group. Explain why that does not invalidate the findings of the experiment.
based on interviews with 83 sars patients researchers found the the mean incubation period was 4.3 days with a standard
What is the standard error of estimate? Briefly describe how you interpret this statistic. What is the coefficient of determination? What does this statistic tell you?
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