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During World War II, 12,000 able-bodied male undergraduates at the university of Illinois participated in required physical training. Each Student ran a timed mile. Their times followed the normal distribution with mean 7.11 minutes and a standard deviation 0.74 minute. An SRS of 100 of these students has mean time 7.15 minutes. A second SRS of size 100 has a mean 6.97 minutes. After many SRS, the many values of the sample mean follow the Normal distribution with mean 7.11 minutes and standard deviation 0.074 minute.
a) What is the population? What values does the population distribution describe? What is this distribution?
b) What values does the sampling distribution of x describe? What is the sampling distribution?
Fit a linear regression model for bp against sodium. Do you think this is a model with a good fit? Why?
At the time she was hired as a server at the Grumney Family restaurant, Beth Brigden was told, "You can average at least $20 a day in tips." Over the first 35 days she was employed at the restaurant
If the packets are sold in multi-packs containing six packets, what is the distribution of the number of prizes in a randomly chosen multi-pack?
Is the proportion of men who felt that division of housework was fair greater than the proportion of women who felt the division of housework was fair? Use alpha = .05 for the test.
Determine the probability that the number of people who show up will exceed the capacity of the plane?
An advantage of the permutation test over the t test for a difference in means is that - distribution interval or a bootstrap percentile interval
Independent random samples of 12 users of the other system rate their system on the same scale. Based on these data, are the two telecommunication system equally liked? Explain.
A shipment of 500 dolls is received by Panda Importers. The quality control manager selects a random sample of 75 to test. Five are bound to be defective. Construct a 90 percent confidence interval for the population proportion of defective dolls ..
Form the cumulative percentage distribution and plan a cumulative percentage polygon.
Quality Progress, Feburary 2005, reports on the results achieved by Bank of America in improving customer satisfaction and customer loyalty by listening to the "voice of the customer".
How would I go about finding a 95% confidence interval for the population mean if a sample of size 20 has a mean of 18.2 and a sample standard deviation of 3.6?
Assume that the two tests use different scales to measure the same aptitude. If someone gets a SAT score that is the 67th percentile, find the actual score and the equivalent ACT score.
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