C207 Data Driven Decision Making exam 2023 with 100% complete solutions
How would a greater number of samples and a fewer number of populations affect an ANOVA analysis? correct answersThe results would be more accurate. Mary is determining the likelihood that she will lose money on an investment. There is an expected 10 percent gain in a normally distributed dataset, with a standard deviation of 10 percent. The likelihood she'll lose money is _______ percent. correct answers16 Select the choice that is true. Regression analysis: correct answerstakes information from one data set and can predict information for another data set. Jane works for a public health company. She is working on an anti-tobacco campaign and is interested in how smoking cigarettes affects a smoker's cholesterol. She could use the number of cigarettes smoked per day as her _____ variable and place it on the __-axis. correct answersindependent, x We perform a regression analysis on a pair of variables and determine that there is a linear relationship. The regression line is determined to be y=12x−5y=12x-5. What type of linear relationship exists between the independent variable, x, and the dependent variable, y? correct answerspositive describe R-squared? correct answersa) R-squared measures the goodness of fit. b) R-squared can be misleading if there are false independent variables. c) R-squared is 1.0 when correlation is -1 or 1.
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