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Suppose that we wish to estimate the average daily pollution in Lake Erie. The daily yield, recorded for n = 50 days, produced a mean and standard deviation equal to y = 871 tons and s = 21 tons, respectively.
a. Estimate the 95% confidence interval for the average daily yield.
b. How many observations would be required to reduce the confidence interval by 10%?
the number of nonconforming switches in samples of size 150 are shown below. construct a fraction nonconforming control
She concluded that encouraging teachers to be properly attired will increase academic performance. Do you agree or disagree with her conclusion? Support your answer.
Ophelia O'Brien, VP of Consumer Credit of American First Banks (AFB), monitors the default rate on personal loans at the AFB member banks.
1.a rbd on the number of insects was performed yielding the following table. test the constrast if insecticide 1 and 2
if in an observational study the statistical analysis has shown convincing evidence that the mean levels differed in
A prison official wants to estimate the proportion of cases of recidivism. In examining 250 convicts there are 65 cases. with 99% confidence interval what is the range? How do you figure this type of problem?
question during 9 surveys throughout the past decade the apartment vacancy rates in minneapolis in percentage were
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
The New York Times reported (L.J> Flynn, Tax Surfing, The New York Times, March 25, 2002, p. C10) that the mean time to download the home page for the internal Revenue Service (IRS) , was 0.8 second. Suppose that the download time was normally di..
Estimate the true mean tensile strength of bars of this size and tyoe using 90% confidence interval. List any assumptions you need to make. Given n=150, x(bar)=477N/mm^2, and s=13.
write up answers 1-2 pages in length to each of the following.1. the essential components of hypothesis testing are the
A gambler has developed two strategies for betting in the game of blackjack. To test these strategies, he decides to go gambling on a casino boat.
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