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An analyst wishes to include number of older siblings in family as a predictor variable in a regression analysis of factors affecting maturation in eighth graders. The number of older siblings in the sample observations ranges from 0 to 4. Discuss whether this variable should be placed in the model as an ordinary quantitative variable or by means of four 0, 1 indicator variables.
Crete a 90% confidence interval for mean Secchi dish measurement.
Search the Internet to find three applications of statistical concepts that you find interesting, that you encounter on a daily basis, or that you find in your profession.
You create a 95% confidence interval for your average score and it is (76.347, 79.133). Given this information, what is the best conclusion?
Determine the variance of X? (Illustrate your computation either in Table or in Equation form)
Utilize a test of the difference among proportions when answering these questions. Illustrate the research hypothesis.
Stock A has an expected return of 12% and a standard deviation of 40%. Stock B has an expected return of 18% and a standard deviation of 60%. The correlation coefficient between Stocks A and B is 0.2.
The theory underlying inferential statistics and other theoretical aspects are subjects we do not often consciously think about in our daily activities.
The branch manager of a pet supply store wants to study characteristics of customers of his store. In particular, he decides to focus on two variables
Explain how one extreme score influences mean and standard deviation.
First, write down three social problems (e.g., drug abuse, gang membership, bullying, domestic violence, child abuse, etc) that we might attempt to predict using logistical regression.
At the 0.10 significance level, can we conclude that the annual rates of return are higher on the big board?
A recent article in Business Week listed the "Best Small Companies." We are interested in the current results of the companies' sales and earnings.
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