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For the data set below, if you were to fit a regression equation, what would the value of R2 be, to two decimals? Hint: Recall that R2 is related to the correlation value r in simple linear regression.
x y
3 11
18 6
14 8
Find a 90% confidence interval for the mean amount spent by patients at the pharmacy. Show your calculations and/or explain the process used to obtain the interval.
This exercise is a "what if analysis" designed to determine what happens to the test statistics and interval estimates when elements of the statistical inference change.
We say that two things have a positive relationship if they move in the same direction, or as one thing increases, so does the other. Or if one thing decreases, so does the other.
In drawing an inference using a single mean in hypothesis testing, you often have a choice between doing a z-test or a t-test. Many researchers will always choose to do the t-test even under circumstances where the z-test would work as well.
two different sprays for rewaterproofing parkas are compared by treating 5 parkas with spray 1 and 6 with spray 2.
Identify a business research issue, problem, or opportunity facing your organization that can be examined using Hypothesis Testing. Describe the results of a hypothesis test on your selected research issue, problem, or opportunity.
The following table describes the estimated green power sales by renewable energy in 2008: Develop a bar chart, pie chart, and Pareto Chart.
Listed below is the rate of return for one year. Using the .05 significance level is it reasonable to conclude that the mean rate of return is more than 4.50%?
In an industry,200 workers,employed for a specific job,were classified according thier performance and training received/not received to test independence of specific trainig and performance.The dates is
an urn contains w1 white and b1 black balls. a second urn contains w2 white and b2 black balls. a ball is selected at
The germination success rate for begonia seeds is 60%. In a package of 200 seeds,
Is there evidence of a significant difference in the variance of the access read times for the three file sizes? Test at the 95% confidence level.
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