# Project #16303 - Statistics/Confidence Levels

1 Calculate the approximate sample size for each of the following at 95 percent confidence.

a. Standard deviation = 10, (ME) = 0.4, two tail

b. Standard deviation = 10, (ME) =0.5, one tail

c. standard deviation = 10, (ME) = 1.5, two tail

d. Standard deviation = 10, (ME) = 1.5, one tail

2. A hospital administrator wants to measure average costs per stay in his institution.  He is willing to be within \$200 of the true value with a probability of 95 percent.  An initial investigation of a random sample of ten records determined that the standard deviation of cost was \$3,987.  How large a sample will need to be taken to meet the administrator's needs?

3. The proportion if true emergencies coming to an emergency room is believed to be 60 percent.  How large a sample of visits would the emergency room administrator have to take to confirm this 60 pecent with a measurement  error (ME) of 0.05?

Thanks!  If there is an internet problem, please let me know so I can cancel the project.

 Subject Mathematics Due By (Pacific Time) 11/08/2013 08:00 am
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