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Investigators in a clinical trial use a random number generator to determine which treatment group each subject will be assigned to; in particular, there is a certain probability of being placed in the placebo group.
a. Which of these is it: 0.25, 2.5, or 25?
b. Was the probability based on equally likely outcomes, a long-run set of observed outcomes, or subjective assessment?
Analyze these data and summarize your findings for managers. Explain how information can be used by decision makers. Assume that sales per customer are normally distributed.
A normal population has a mean of 80.0 and a standard deviation of 14.0. Compute the probability of a value between 75.0 and 90.0.
there are twelve zodiac signs and each person is born under exactly one sign. suppose that each sign is equally likely
Complete the appropriate test to determine whether there is a significant difference in mean profit between the two regions.
Give graphical and numerical summaries for these data.- Compute a 95% confidence interval for the mean call length. Comment on the validity of your interval.
Suppose that the average annual salary for a worker in the United States is $30,000 and that annual salaries for Americans are normally distributed with a standard deviation equal to $7,000. Determine the following:
Assuming the tires are selected at random from among all tires being produced, how many tires in the shipment of 3000 are expected to have a lifetime that is less than 35,000 miles?
to compare commuting times in various locations independent random samples were obtained from the six cities presented
a market research survey is available for no cost. using a decision tree analysis it is found that the expected value
Find the margin of error for this poll if we want 95% confidence in our estimate of the percent of American adults who approve of cloning humans.
Significance test using the t distribution. A test of a null hypothesis versus a two-sided alternative gives t = 2.18.- The sample size is 18. Is the test result significant at the 5% level? Explain how you obtained your answer.
The financial advisors have been chosen because they are known to range from very conservative (advisor A) to very optimistic (advisor D). The advisors' respective estimates for the three portfolios are shown here. Use the 0.05 level in comparing ..
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