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The incomes in a certain large population of electricians have a Normal distribution with mean $60,000 and standard deviation $8000. Four electricians are selected at random from this population to be shipped to another region.
A. The distribution of the mean, x-bar, is Normal with mean $30,000 and standard deviation $8000.B. The distribution of the mean, x-bar, is Normal with mean $15,000 and standard deviation $8000C. The distribution of the mean, x-bar, is Normal with mean $60,000 and standard deviation $2,000.D. The distribution of the mean, x-bar, is Normal with mean $60,000 and standard deviation $4000.
For the other 25 percent of the population, the drug has no effect on colds. If an individual tries the drug for a year and has 2 colds in that time, what is the probability that the drug is beneficial to that individual?
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p- value.
A 95% confidence interval for the proportion of all adults who bought a lottery ticket in the past year is (assume Gallup used an SRS)
Suppose that you're the Quality Manager for the Emerson D. Meritz Machine Tool Company. Your model IE566 grinding machine is afflicted by three types of defects classified as major (type A), serious (type B) and minor (type C).
Observations are taken on net revenue from sales of Hughes, HNS, and satellite services to see if offering rebates is beneficial for the organization.
Find the expected frequency to test the claim that walking and low, moderate, and high blood pressure are not related. Round to the nearest tenth if necessary.
Is there enough evidence to believe that the average credit card debt has increased? Use a=0.05. Give a possible reason as to why or why not the debt was increased.
Determine the maximum error of the estimate, E. Determine the confidence level used for the given confidence interval.
A study of 20 families in a certain large city showed that the average income was $33,210 in 2000 with a standard deviation of $1800. Test the hypothesis that the true average income in this city was actually $31,000 against the hypothesis that it..
"MagTek" electronics has developed a smart phone that does things that no other phone yet released into the market-place will do. The marketing department is planning to demonstrate this new phone to a group of potential customers, but is worried abo..
There are 10 rolls of film in a box and 3 are defective. Two rolls will be selected, one after the other. What is the probability of selecting a defective roll folloed by another defective roll?
How much variability will you have if you predict sales with this model?
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