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In a regression analysis, if a new independent variable is added and R-squared increases and adjusted R-squared decreases precipitously, what can be concluded?
(a) The new independent variable improves the predictive power of the regression model.
(b)The new independent variable does not improve the predictive power of the regression model.
(c) The regression was performed incorrectly. It is impossible for R-squared to increase and adjusted R-squared decrease simultaneously.
(d) The new independent variable's coefficient is not significant at the 0.01 level.
Carefully define a standard normal distribution. Why does a researcher want to go from a normal distribution to a standard normal distribution? Explain.
Use confidence interval to determine the estimated margin of error, Then determine the sample mean.
In your own words, define epistemology and ontology. Why are these concepts important to the study of research? How might the concepts influence your future research?
Seventy million pounds of trout are grown in the U.S. every year. Farm-raised trout contain an average of 32 grams of fat per pound, with a standard deviation of 7 grams of fat per pound.
Reliable Furniture is a family business that has been selling to retail customers in the Chicago area for many years. They advertise extensively on radio and TV, emphasizing their low prices and easy credit terms.
What sample size would be needed to obtain an error of +/- 10 square millimeters with 99% confidence?
What is the possible uses of regression and correlation analysis in doctoral-level research? Would I be able to use these techniques in my dissertation, or any application in other areas?
The lifetime of a color television picture tube is normally distributed with the mean of 7.8 years and a standard deviation of 3 years.
Find out the suitable critical value(s) for this situation given a 0.05 significance level. Find out/compute the value of sample test statistic.
Report a table of marginal means for each level of each of the three factors.
At α = .01, did yellow fire trucks have a considerably lower accident rate? Determine sample proportions and z test statistic.
It could not do anything with the airport and suffer a loss of revenue. The current value of raised revenue from a new airport is in question.
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