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A certain medication is known to increase the pulse rate of its users. The standard deviation of the pulse rate is know to be 4 beats per minute. A sample of 40 users had an average pulse rate of 98 beats per minute. Find the 95% confidence interval of the true mean (of the population)?
Give at least 2 properties of a good estimator
What do we mean by a 95% confidence interval?
If one wanted to increase the confidence interval would you expect to decrease or increase the interval?
A nurse wants to estimate the birth weight of infants. How large of a sample must she select if she desires to be 95% confident that the true mean is within 5 ounces of the sample mean? The standard deviation in known to be 8 ounces.
For a group of men subjected to a stress situation, the mean of the number of heartbeats per minute was 126, and the standard deviation was 4. Find the 95% confidence interval of the true mean.
A factory finds,on average, 20% of the widgets produced by a given machine will be defective for certain specified requirements.
Healthcare issues are receiving much attention in both academic and political arenas. Compute the arithmetic mean age of the uninsured senior citizens to the nearest hundredth of a year.
To determine her blood pressure, Carolyn divides her day into three parts; morning, afternoon, and evening. She then measures her blood pressure at 4 randomly selected times during each part of the day. What type of sampling is used?
Determine the Midrange. Determine the Standard Variance. Determine the Standard Deviation
Critique the HR manager's planned approach and give him advice on how to proceed. You can assume that a reasonable estimate for the proportion of new hires that are happy with the company is .8.
What control limits should be applied to his sample?
We want to know if his support has decreased. In computing a test of hypothesis with , what is the estimate of the overall proportion?
Describe the relevant population and the source (e.g. newspaper, TV, radio, internet, etc.). Explain why you do not believe it is accurate.
what size sample should the director choose if she wishes to estimate the mean number of admissions per 24-hour period to within 1 admission with 99 percent reliability.
A manufacturer of executive jet aircraft is concerned with its profit picture over the short run. It produces two different models of planes, x1 and x2. Its profits are $30,000 for each x1 and $20,000 for each x2. There are two major constraints o..
A project manager at COMSOFT corporation has collected statistics on the organization's software development process. He has the size of each project in number of lines of code for the past 20 projects and the number of lines of code in error disc..
When performing a 2-way ANOVA with replication you must first: A) Perform an interaction hypothesis test B) Take out the error because you ran replicates and error makes no sense with replicates
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