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Americans consume an average of 1.64 cups of coffee per day. Assume the variable is normally distributed with a standard deviation of .94 cups. If 25 people are selected at random, what is the probability that they will drink an average of less than 2 cups of coffee per day?
What was the approximate size of the sample?- What is an approximate 95% confidence interval for the percentage of the corresponding population who favor gun control?
The grades on the midterm examination given in a large managerial statistics class are normally distributed with mean 75 and standard deviation 9.
Use an appropriate 95 percent confidence interval to estimate the difference between the mean prices of the two brands of cd players. Do you think that the difference haspractical importance?
Given your answer in part (a), which of these two alternative headlines do you think would be preferable: "Breast-feeding leads to better school performance" or "Link found between breast-feeding and school performance"? Explain.
A seed distributor claims that 80% of its beet seeds will germinate. How many seeds must be tested for germination in order to estimate p, the true proportion that will germinate, so that the maximum error of the estimate is " = 0:03 with 90% con ..
Chi-square test for independence of attributes - Describe why a x 2 test of the resulting contingency table is appropriate for such an investigation.
A random sample is selected from a normal population. The population mean is 60 and the standard deviation is 15. after treatment the sample mean is 65. the sample size is 25.
Families in a certain area that are living below the poverty level. If this proportion is roughly 0.15, what sample size is necessary so that the standard error of the estimate is 0.02?
Identify a business situation where you might want to make an estimate. For example, you might want to estimate the mean dollar amount spent by customers at a retail store.
in the last quarter of 2007 a group of 64 mutual funds had a mean return of 4.8 with a standard deviation of 5.5. if
in the game of craps two dice are thrown and the outcome of a bet is based on the sum of the two dice. if you bet 1
A large university says the mean number of classroom hours per week for full-time faculty is more than 9. A random sample of the number of classroom hours for full-time faculty for one week is listed. At 945; = 0.05 , test the university's claim.
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