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Hays Medical Center wants to estimate the percentage of adults who exercise at least 1 hour per week. How large a sample should be selected in order to estimate this proportion with a 99% confidence level and a margin of error of at most 3%? (Assume no preliminary estimate of p-hat is available.)
Generate three random observations from the uniform distribution between -10 and 40 by using the following random numbers:
The width of an interval is half of the difference between its upper and lower bounds. The width is a measure of the uncertainty of the number specified by the interval.
for a normal distribution find the percentage of data that are a within 1.32 standard deviations of the mean. b between
The class mean was 105 and the standard deviation 15. On the third exam, the mean was 45 and the standard deviation 3. Ableson got 51. Which test should be dropped?
How many households must be (randomly) sampled to be 95% sure that the sample mean is within 15 minutes of the population mean? Assume that a pilot study estimated the value of σ = 35 minutes.
a pair of fair six-sided dice are tossed independently of each other.a list the sample space of this experiment.b
suppose that you have 200000 to invest in stocks. if you invest 1000 in any particular stock your prot will be equal in
A state meat inspector in Iowa has been given the assignment of estimating the mean net weight of packages of ground chuck labeled “3 pounds.” Of course, he realizes that the weights cannot be precisely 3 pounds. A sample of 36 packages reveals the m..
What is the difference between statistical significance and practical significance? What is a type I and type II errors in hypothesis testing? What would be examples of each? Explain
Refer to Productivity improvement Problem 16.7. The economist also has information on annual productivity improvement in the prior year and wishes to use this information as a concomitant variable. The data on the prior year's productivity im..
sometimes the geometric random variable is defined to be the number of trials x preceding the first success. write down
The hospital was 12.0 weeks with the standard deviant of 1.0 week. Out of 100 patients, how many would you expect to stay longer than 13 weeks?
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