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An opinion poll asks a simple random sample of 100 college seniors how they view their job prospects. In all, 53 say "good." Does the poll give reason to conclude that more than half of all seniors think their job prospects are good? The hypotheses for a test to answer this question are?
Electricity is commonly traded at the California-Oregon border (COB) and Palo Verde (PV) in Arizona. Assume you take a sample of 100 daily electricity market closing prices (in $/megawatthour) from both COB and PV.
Paired samples t-test for the given data - financial advice from the voluntary organization - A local voluntary organization affiliated to the Citizens Advice Bureau offers free financial advice to residents in the area who are registered debtors
An airline has surveyed a simple random sample of air travelers to find out whether they would be interested in paying a higher fare in order to have access to e-mail during their flight.
Create a bell curve chart that shows the number of men needed per day for a 10,000 man hour job. The start date is 1/1/2008 and the end date is 6/1/2008.
The foreman at a large plant estimates defective parts about 1.5% of the time. If the plant produces 25,000 parts in a week, what is the standard deviation (to the nearest tenth) for the number of defective parts?
Suppose that in a random sample of size n, there are x1, x2, and x3 number of genotypes s1,s2 and s3 respectively where x1+x2+x3=n. What sort of distribution is this?
At the .05 level of significance, is there convincing evidence that the number of absences per employee has increased?
How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .25 hours?
Suppose that you are interested in determining the relation between the students average SAT scores [x] and their freshman GPA [y].
Discuss some of the common uses of IQ tests. Do you think that IQ test should be used for these purpose? Does the Flynn effect alter your thoughts about the uses of IQ test? Explain.
Conduct a one-sided hypothesis test of the claim that corner-lot houses have higher average selling prices than those located on non-corner lots.
Find the probability that in a given month:
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