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Question: Suppose that an ESP test is conducted by having someone guess whether each of n coin flips will result in heads or tails. The null hypothesis is that p = .5, and the alternative is that p > .5, where p = probability of guessing correctly. Suppose one participant guesses n = 10 times and gets 6 right, while another guesses n = 100 times and gets 60 right. In each case, the percent correct was 60%. Do you think that the p-value would be lower in one case than in the other, or would it be the same? Explain.
A sample of 65 business people was randomly selected and given a leadership test. Construct a 95 percent confidence interval for the mean score on this test, using the estimated standard error of the mean.
People in a large population average 60 inches tall. You will take a random sample and will be given a dollar for each person in your sample who is over 65 inches tall. Does the law of average relate to the answer you give?
A stationary store wants to estimate the mean retail value of greeting cards that it has in inventory A random sample of 100 greeting cards. a mean value of 2.55 and standard deviation of 0.44
It is said that happy and healthy workers are efficient and productive. A company that manufactures exercising machines wanted to know the percentage of large companies that provide on site health club facilities. A sample of 240 such companies s..
if two random samples of size 400 are drawn from two populations that have standard deviations of 60 and 8 respectively
Researchers routinely choose an alpha level of 0.05 for testing their hypotheses. What are some experiments for which you might want a lower alpha level (e.g., 0.01)? What are some situations in which you might accept a higher level (e.g., 0.1)?
to perform a certain type of blood analysis lab technicians must perform two procedures. the first procedure requires
Serena Williams made a successful first serve 67% of the time in a Wimbledon finals match against her sister Venus. If she continues to serve at the same rate the next time they play and serves 6 times in the first game, determine the following pr..
At.01 significance level, is there difference in mean number of times men and women order take-out dinners in month? Determine the p -value?
"What is a critical value? How is the critical value determined? Are there differences between the standard normal table and the student t table when trying to determine the critical value? Explain."
Suppose that we use the same idea, but instead of ordinary averages we use weighted averages with as the weight for the th factor-level combination. Derive the new zero-sum restrictions for these weighted averages.
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.
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