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Suppose you are testing the differences in attitudes toward health care reform using Democrats, Republications, and Independents. What statistical test would you use?
After performing a two sample t-test, you see a p-value of 0.0355. Of the following, which is the appropriate conclusion?
The data results are based on serum continine levels for each group. The claim is that exposure to tobacco smoke (as second-hand smoke) corresponds to higher levels of cotinine.
Develop a linear trend equation for the time series. Graph the time series and the linear trend equation. What appears to be happening to capital expenditures? What is the forecast one year, or four quarters, into the future?
Recognize the given samples are independent samples or matched pairs.
Plot fitted values against residuals. Does this plot point out any problems with homoscedasticity?
Machine which fills quart milk cartons is set up to average 32.2 oz per carton, with standard deviation of 1.2 oz. Determine probability that filled carton will contain less than 32 oz of milk?
Scores ranged from 0 to 40 with higher scores reflecting greater computer anxiety. This variable was measured on the interval scale. The researcher analyzed the data using what t test?
A discrete random variable Y takes the value -1, 0 and 1 with probabilities 1/2θ, 1- θ and 1/2θ respectively. Let Y1 and Y2 be two independent random variables, each with the same distribution as Y.
Illustrate what was the lowest score earned on the exam. Explain how many students scored within 3 standard deviations of the mean.
In a shipment of 79 vials, only 17 do not have hairline cracks. If you randomly select 3 vials from the shipment, what is the probability that all 3 of the selected vials have hairline cracks?
Write the null and alternative hypotheses for testing if participants and non-participants differ in level of problem behavior (Y).
Locate the results of a recent survey in a newspaper, magazine, or Internet article. Outline the survey data so that your peers can understand the variables and results, and then identify at least one key formula from this Module that you could us..
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