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In the article, "A Multifactorial Intervention Program Reduces the Duration of Delirium, Length of Hospitalization, and Morality in Delirious Patients" (Journal of the American Geriatrics Society, Vol. 53, No.4, pp. 622-628), M. Lundstrom et al. investigated whether education programs for nurses improve the outcomes for their older patients. The standard deviation of the length s of hospital stay on the intervention ward is 8.3 days.
a. For the variable "length of hospital stay," determine the sample distribution of the sample mean for samples of 80 patients on the intervention ward.
b. The distribution of the length of hospital stay is right skewed. Does the invalidate your result in part (a)? Explain your answer.
c. Obtain the probability that the sampling error made in estimating the population mean length of stay of a sample of 80 patients will be at most 2 days.
Find the equivalent Z score, the percentage of the area above the score, and the percentage of the area below the score.
Does this data indicate that the sentiment for increasing the speed limit is different for the two groups of residents? Let p1 refer to the urban population.
Should the engineering firm be concerned? Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.
A stockbroker at Critical Securities reported that the mean rate of return on a sample of 10 oil stocks was 12.6 percent with a standard deviation of 3.9 percent. The mean rate of return on a sample of 8 utility stocks was 10.9 percent with a standar..
suppose a manufactuirng company make a certain item. the time to produce each item is normally distributed around a
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What is the probability that Company B would charge more than Company A to drill a well - The depths of wells drilled in this area have a normal distribution with a mean of 250 feet and a standard deviation of 40 feet.
What do we need to consider when we try to select a test? Choose one of the tests; discuss your understandings of that test.
Test the hypothesis that the proportion of all student cell phone users in the United States who own a smartphone is 35%. Use the 5% level of significance and report your results.
We select a random sample of college graduates employed full-time and find that the mean of the sample is 36 hours and that the standard deviation is 5 hours.
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billiard ball a is moving in the y-direction with a velocity of 1.4 ms when it strikes ball b of identical size and
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