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A sample of difference scores from a related-samples t-test has a mean difference of 4 with a standard deviation for the difference scores of 6.
-If n=4, is this sample sufficient to reject the null hypothesis using a two-tailed test with an alpha of 0.05?
-If n=16, is this sample sufficient to reject the null hypothesis using a two-tailed test with an alpha of 0.05?
-How does size of the sample influence likelihood?
An efficiency expert wants to determine whether the time an assembly worker requires to perform a standard task might be related to (1) the number of years on the job and (2) the score on a pre-employment aptitude test. The following data have bee..
What is the rejection point at α = .01 and indicate if you would accept or reject H o ?
Read Lecture Ten. Lecture Ten introduces the idea that different variables may move together-sometimes due to causation and at other times due to an unknown.
Dr. Hernandez wants to examine the impact of caffeine on test performance. She randomly assigns the 60 students in her class to three groups.
What standard deviation (within 0.001 inch) minimizes the annual cost of producing elevator rails? You do not need to try standard deviations in excess.
He then raised 10 to the power of the endpoints of the interval to get back to dollars. He claims that this is a 95% confidence interval for mean sales. What do you think?
A drug for female sexual dysfunction called Intrinsa was tested in 2004, both for efficacy and for possible dangerous side effects before being considered
Conduct appropriate descriptive statistical analysis, using selected software, for the given data (include appropriate graphs, if possible). Ensure you include screen shots of the MS Excel analysis.
Do you think that this incentive to rat people out would lead to a lot of false accusations or do you think that it encourages people to do the right thing?
Sample of 100 measurements were taken to analyze concentration of impurities in a product. Calculated sample mean was 65 ppm (parts per million). Assuming that population standard deviation is 20 ppm, estimate margin of error and confidence interv..
Retrieve the state teachers' wage data (teachrwage.html) and construct the following graphical displays.
The least squares regression equation for the data in the following table is y^ = 5 + 2x.- Calculate the value of y^ for each data point.
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