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A doctor who wants to estimate the HDL cholesterol of all 20-29 year old females. How many subjects are needed to estimate the HDL choelsterol within 2 points with 99% confidence assuming o=16.1? Suppose the doctor would be content with 95% condifence. how does that decrease in confidence affect the sample size required?
A) A 99% confidence level requires ___ subjects.
B) A 95% confidence level requires ___ subjects.
Estimate with 90% confidence the mean number of weeks out of town, assuming that the population is normally distributed with a standard deviation of 6 weeks.
Standard deviation 2.8 inches. (a) If you choose one student at random, what is the probability that he is between 69 and 71 inches tall?
Plot the sales data as a time series and do you think this series is stationary or nonstationary
Calculate the arithmetic mean age of the uninsured senior citizens to the nearest hundredth of a year. Identify the median age of the uninsured senior citizens
according to the national association for college admissions counseling and usa today. 19.8 of college students take at
A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages.
Is there sufficient evidence for concluding that true average repair time exceeds 200 min? Carry out a test of hypotheses using a significance level of .05.
What is the major difference between finding significance and confidence intervals using population samples or using population proportions?
According to the Insurance Institute of America, a family of four spends between $400 and $3800 per year on all types of insurance. Suppose the money spent is uniformly distributed between these amounts.
given a normally distributed population with u 80 and 05. what is the probability of randomly drawing a score that
If one-third of the University of Wisconsin teaching assistants (TAs) sign a petition calling for a collective bargaining election, an election will be held. A survey of 50 TAs indicates that 40% will sign the petition. What is the probability ..
To test the difference between two means using two mean z test.
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