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A local health center noted that in a sample of 400 patients 80 were referred to them by the local hospital. a) Provide a 95% confidence level for all the patients who are referred to the health center by the hospital. b) What size sample would be required to estimate the proportion of hospital referrals with a margin of error of 0.04 or less at 95% confidence?
The New York Times reported (L.J> Flynn, Tax Surfing, The New York Times, March 25, 2002, p. C10) that the mean time to download the home page for the internal Revenue Service (IRS) , was 0.8 second. Suppose that the download time was normally di..
Verify value of t for the independent Variable, using formula. (That is, using formula in the Formula Sheet compute the t statistic , given data provided in the print out).
What is the 95% confidence interval for the true average number of hands per hour during peak hours?
Test hypothesis that people in State A are more depressed than U.S. population. Illustrate all of your hypothesis steps. (Use alpha = .01.)
Note down a research that requires a decision making with probabilities.
Report the t-value, whether you accept or reject Ho, and whether the difference was significant in a brief sentence.
Based on these results, the proportion of the variation in 1993 winnings that is explained by the average number of putts per round and driving distance
It is better to use the median rather than the mean for a distribution when:
At the .01 level of signiicance, is the true mean greater than 10?
The numbers of years served by selected past members of the U.S. Supreme Court is listed below. Find the percentile rank for each value. Which value corresponds to the 40th percentile? Construct a boxplot for the data and comment on their shape.
The measure of forecast accuracy that is not influenced by the measurement scale of the time series data is:
Shopper Trak is a hidden electric eye designed to count the number of shoppers entering a store. When two shoppers enter the store together one walking in front of the other, the following possibilities apply.
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