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Suppose a group of 900 smokers (who all wanted to give up smoking) were randomly assigned to recieve an antidepressant drug or a placebo for six weeks. Of the 162 patients who recieved the antidepressant drug, 37 were not smoking one year later. Of the 738 patients who recieved the placebo, 145 were not smoking one year later. Given the null hypothesis Ho: (p1 - p2) = 0 and the alternative hypothesis Ha: (p1 - p2) =/0 , conduct a test to see if taking an antidepressant drug can help smokers stop smoking. Use (alpha symbol)= 0.08
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?
let the number of trials be n = 3, and let the probability of success be p = 0.0228. Use a calculator to compare:
When the economic situation is "high," a certain economic indicator rises with probability 0.6. When the economic situation is "medium," the economic indicator.
A sample of 100 one-dollar bills from the Subway cash register revealed that 16 had something written on them besides the normal printing (e.g., “Bob ? Mary”). (a) At α = .05, is this sample evidence consistent with the hypothesis that 10 percent or ..
The average cost of a renting a compact size car in a major metropolitan area is R51.74 with a standard deviation of 7.48. Assume a normal distribution.
test the hypothesis using the classical approach and the p-value approach.ho p 0.45 versus hi p lt 0.45n 150 x 62 a
Should Mark use the study? Why? What is the maximum amount Mark should be willing to pay for this study? What is the maximum amount he should pay for any study?
1. a sample survey of 54 discount brokers showed that the mean price charged for a trade of 100 shares at 50 per share
Examine the data graphically. Do they appear to violate any of the conditions needed to use the one-sample t confidence interval for the population mean?
A commercial jet aircraft has four engines. For an aircraft in flight to land safely, at least two engines should be in working condition.
Determine the sample size required to estimate the average housing price in Wichita to within $500 with a 95% confidence level.
eleven chairs are numbered 1 through 11. four girls and seven boys sit on these chairs at random. what is the
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