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1. I wish to find a 95% confidence interval for the mean number of times men change channels with a remote control during a commercial. Based on a preliminary study, I estimate σ = 15. How many commercials' worth of data do I need to have a margin of error no more than 3?
A. 10B. 97C. 96
2. I have computed a 95% confidence interval for the mean, μ, of a population as (13, 20). Based on this interval,A. there is a 95% chance μ is in the interval.B. 95% of the observations lie in the interval.C. the method gives correct results 95% of the time.
3. A researcher wants to know if tougher sentencing laws have had the desired impact in terms of deterring crime. He plans to select a sample of states which have enacted a "3 strikes" law and compare violent crime rates before the law was enacted and two years later. The correct set of hypotheses to test are
Solve linear program graphically
A teacher gave a 25 question multiple choice test. After scoring the tests, she computed a mean and standard deviation of the scores. The standard deviation was 0. Based on this information
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Which of the following would produce a new confidence interval with smaller width based on these same data and produce a new confidence interval
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