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A medical researcher found a significant relationship among a person's age x1, cholesterol level x2, sodium level of the blood x3, and systolic blood pressure y. The regression eqauation is y1 = 97.7 + 0.691x1 + 219x2 - 299x3. Predict the systolic blood pressure of a person who is 35 years old and has a cholesterol level of 194 milligrams per deciliter (mg/dl) and a sodium blood level of 142 millieqivalents per liter (mEq/l).
(all the x's are italicized and have the # written a little lower than the x-not sure how to type that correctly. The y has the 1 written a little above it)
At α = .05, is there a difference in variances? Illustrate all steps clearly, including the illustration of the decision rule.
Suppose also that the mean score on test A is 85, and the standard deviation is 10; the mean score on test B is 90, and the standard deviation is 16; the scores on the two tests have a bivariate normal distribution; and the correlation of the two ..
Plot the control limits for the mean outside diameter and the range.
How can you or your department decide whether or not the variation is important? How could using a mean difference test help?
Create a 90% confidence interval for proportion of all kernels that would not pop.
First, describe in your own words (no direct quotes, please) what a dummy variable is and its purpose in regression analysis. Secondly, provide an example of where you might use a dummy variable from your own professional experience.
Which component of a time series is most likely to occur? Which component has a pattern that must be complete in a single year and repeat from year to year?
An advertising agency that serves a major radio station wants to estimate the mean amount of time that the station's audience spends listening to the radio daily. From past studies, the standard deviation is estimated as 45 minutes.
From her district, consisting of several hundred stores, she selects a random sample of 30 stores. For each store she gathered the following information.
A safety engineer claims that only 40% of all workers wear safety helmets when they eat lunch at the workplace. Assuming that his claim is right, find the probability that at most 4 out of 6 workers randomly chosen will be wearing their helmets wh..
A data source generates hexadecimal characters. Let X be the integer value corresponding to a hex character. Suppose that the four binary digits in the character are independent and each is equally likely to be 0 or 1.
Ace Jack had no idea whether the $100,000 he pays for training for his used car salespeople works.
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