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Suppose your firm had planned a major research study for November 2001. Given the incidents of September 11, your superior decides to add a question to the study. The question must measure consumers' confidence that the U.S. economic system will be able to rebound following the recession of 2009-2010. Create a scale of each of the following types:
a Constant-sum scale
b Likert-type summated scale
c Semantic differential scale
d Stapel scale
e Forced ranking scale
The Cadet is a popular model of sport utility vehicle, known for its relatively high resale value. The bivariate data given below were taken from a sample of sixteen Cadets
Conduct a test at the .05 level of significance to determine if there is any difference in the mean selling price of new homes in Omaha versus Kansas City.
Please address the following question: When is the mean the best measure of central tendency? When is the median the best measure of central tendency?
A banks loan officer rates applicants for credit. The ratings are causally distributed with a mean of 200 also a standard deflation of 50.
Determine the coefficient of determination (Use Megastat or Excel, Tools, Data Analysis, Regression function). Interpret the result.
Generate survival times X from an exponential distribution with rate lambda=1 with a censoring distribution C being exponential with rate theta = 2/3. Then Plot Kaplan-Meier Survival curve estimates along with true survival curve for n=25,100,1000..
Use the binomial distribution to determine the probability that a student will get at least 8 out of 10 questions on a ten question multiple choice test correct by just guessing if each question has four
What are the null and alternative hypotheses? In what way do the two estimates of the defect rate in question 3g differ?
Describe the data for a correlational research study. Explain how correlational research is different from other research evaluating the relationship between two variables.
Using the z table in Table E of Appendix C, what are the critical values for a two-tailed test when a = 0.03 .
The trial failed to show significance. How many subjects would be required to detect the difference in proportions observed in the trial with 80% power?
Finding appropriate z- and t-scores is important when constructing confidence intervals. Confidence intervals allow one to estimate important population parameters such as population mean, population proportion, population standard deviation, etc.
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