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In a Harris Interactive survey of 1006 adults, 86% say that they wash their hands after using a public restroom; the margin of error is 3 percentage points. USA Today reported that among 6028 adults observed in restrooms, 85% washed their hands; the margin of error is 1 percentage point. Use the given statistics and margin of error to identify the confidence interval for each study. Which study do you believe, and why?
How many dieters must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.25 pound of the true population mean? Assume that the population standard deviation is known to be 10.6 lb.
Bill, Mary, and Tom have coins with respective proximities p1, p2, p3 of turning up heads. They toss their coins independently at the same times.
What is the value of the test statistic you should use to test the given hypothesis?
Two divisions are cooperating in the production of a communications satellite. In order for the launch to be on time, both divisions must meet the deadline.
A Student takes a ten-question true/false quiz, but did not study and randomly guesses each answer. Find the probability that the student passes the quiz with a grade of at least 70% of the questions correct. (Round your answer to three decimal pl..
What is the range of possible sampling error if a random sample of size n = 6 is selected from the population?
Two independent event have probabilities 0.1 and 0.3 what is the probability that neither of the events occurs?
The standard deviation of all possible x values is called the?
a standardized productivity scale has a ? 25 and a ? 5. the ceo of the company wants to know if employee
Suppose a firm evaluates the productivity of the three shifts of workers who work in their factory. Each shift's performance is measured based on the amount of output that is produced during the shift - day, evening, or swing shift.
The sample mean is 2.59 and the sample standard deviation is .66. Conduct the following test using 95% level of confidence. Z-test for Unpaired data.
Construct a 98% confidence interval for the percentage of all customers at this supermarket who enter express lanes with more than 12 items.
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