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The manager of a paint supply store wants to estimate the amount of paint contained in 1-gallon cans purchased from a nationally known manufacturer. The manufacturer's specifications state that the standard deviation of the amount of paint is equal to 0.02 gallon. A random sample of 50 cans is selected, and the sample mean amount of paint per 1-gallon can is 0.995 gallon.
Construct a 99% confidence interval estimate for the population mean amount of paint included in a 1-gallon can.
On the basis of these results, do you think that the manager has a right to complain to the manufacturer? Why?
Must you assume that the population amount of paint per can is normally distributed here? Explain.
Construct a 95% confidence interval estimate. How does this change your answer to (b)?
Studies from a local mall show the typical shopper spends 0.75 hrs shopping. the standard deviation is 0.10 hours. A sample of 45 shoppers revealed the mean time spent increased to .080.
State the alternative hypothesis that would be used to determine if Brand A has a higher proportion of defective smoke detectors than Brand B. Calculate the test statistic for determining if a difference exists between the failure rates of the two..
a pump is used to raise the pressure of water from 0 psig to 55 psia. how much power in kw will be required to pump
Find N(A), R(A), N(A^T),R(A^T). Show that the fundamental subspace theorem holds: N(A^T)=R(A)^(upside down T), N(A)=R(A^T)^(upsidedown T). Hint: Notice that the fourth row is the sum of the first three rows.
What kinds of statistical data might a burglar alarm company employ in trying to convince urban homeowners to purchase its product?
Standard deviation of 44.7 mg/dL. Let x signify serum total cholesterol level for U.S. females 20 years old or older. Draw the distribution of the variable x.
suppose that the distance from one end of a pole and the other be modeled by a normal distribution with mean 47.5 and
Supposing that the entire $10,000 can be spent on tires (ignoring other costs), and that the true fraction that will fail is approximately .05, can NHTSA attain its goal while staying within the budget? Describe.
seventeen people are randomly chosen from people in the u.s. and asked do you have brown eyes? does this procedure
Among coffee drinkers, men drink a mean of 3.2 cups per day with a standard deviation of 0.8 cups. assume the number of coffee drinks per day follows a normal distribution.
This second sample had an average response of 132 with a sample variance of 16. What is the pooled standard deviation for this problem?
Five cards are drawn from an ordinary deck without replacement. Find the probability of getting:
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