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The U.S. Dairy Industry wants to estimate the mean yearly milk consumption. A sample of 16 people reveals the mean yearly consumption to be 60 gallons with a standard deviation of 20 gallons.
a. What is the value of the population mean? What is the best estimate of the value?
b. Explain why we need to use t distribution. What assumption do you need to make?
c. For a 90 percent confident interval, what is the value of t?
d. Develop the 90 percent confidence interval for population mean.
e. Would it be reasonable to conclude that the population mean is 63 gallons?
How to calculate the trimmed mean for each sample by deleting the smallest and largest observation and then corresponding trimming percent ages.
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Based on the result, does there to be an overall perception of 1 minute that is reasonably accurate?
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What is the probability that 30% or fewer male employees will indicate that they have to pick up the slack for mom's working flextime ?
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What is the difference between strong negative and strong positive correlation? What does zero correlation tell you? Can you share a relationship between two variables that is typically negative?
A sample of 60 smokers has a mean cotinine level of 125. Assuming that sigma=25, find the 90% confidence level estimate of the mean cotinine level of all smokers.
Assume that demand for the upcoming weekend is normally distributed with a standard deviation of 30.
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We want to estimate the population mean within 5, with a 99% confidence level. The population std dev is estimated to be 15. How large is the required sample size?
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