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A Gallup Poll asked a sample of Canadian adults if they thought the law should allow doctors to end the life of a patient who is in great pain and near death if the patient makes a request in writing. The poll included 270 people in Quebec, 221 of whom agreed that doctor assisted suicide should be allowed.
(a) What is the margin of error of the large-sample 95% confidence interval for the proportion of all Quebec adults who would allow doctor assisted suicide?
(b) How large a sample is needed to get the common +(line underneath +) 3 percentage point margin of error?
Samples of size 49 are taken from a population with a σ of 17. If the mean of the sample is 25, what is the confidence interval at the 90% confidence level
A sample of 350 lenses and found 5 lenses with surface defects. Formulate an appropriate test for the qualification of the polishing machine using an α = 0.05."
Scores on a scholastic aptitude test are normally distributed with standard deviation σ=100 points. A group of 25 inner city high school students takes the test; their mean scores is x-bar = 440 points.
Find out the forecast value utilizing three month moving average method, weighted moving average method, exponential smoothing and regression methods.
A cognitive psycholgist believes that a particular drug improves short-term memory. The drug is safe, with no side effects. An experiment is conducted in which 8 ramdomly selected subjects are given the drug and then given a short time to memorize..
Can we conclude that the mean time for a game is less than 3.50 hours? Use the .05 significance level.
Find the probability that exactly 15 flights arrive on time.
Test the mean cholesterol content in the egg is greater than 2.5 percent
Researchers are studying the absorption of two drugs into the bloodstream. Each drug is to be injected at three dosages. There are 24 people in the study, and they are randomly divided into six groups.
At.05 significance level, is there a difference in mean number of calls per day between 2 employees? Compute the p -value?
What is the probability that a random person has an IQ between 85 and 115? Find the 90th percentile of the IQ distribution.
A 99% confidence interval estimate of the population mean can be interpreted to mean that we have 99% confidence that the true population mean will fall within the confidence interval estimate.
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