In the context of regression analysis, which of the following statements are true? An influential point is an outlier that greatly affects the slope of the regression line. One way to test the influence of an outlier is to compute the regression equation with and without the outlier. When the data set includes an influential point, the data set is nonlinear. Influential points always reduce the coefficient of determination. All outliers are influential data points. I only II only III only All of the None of the above Suppose a researcher conducts an experiment to test a hypothesis. If she doubles her sample size, of the following will increase? The of the hypothesis test. The effect size of the hypothesis test. The probability of making a Type II error. I only II only III only All of the above None of the above You conduct a hypothesis test and you observe values for the sample mean and sample standard deviation when n = 25 that do not lead to the rejection of . You calculate a p-value of 0.0667. What will happen to the p-value if you observe the same sample mean and standard deviation for a sample > 25? Increase Decrease Stay the same May either increase or decrease Remain constant What is the standard deviation for the data given: 5, 10, 7, 12, 0, 20, 15, 22, 8, 2 (mean 10.1) 6.89 10.1 7.26 9 5.26 Rome, November 24 2016 Answer corrector table: put a cross in correspondence to the selected answer N° a b c d e N° a b c d e
In the context of regression analysis, which of the following statements are true? An influential point is an outlier that greatly affects the slope of the regression line. One way to test the influence of an outlier is to compute the regression equation with and without the outlier. When the data set includes an influential point, the data set is nonlinear. Influential points always reduce the coefficient of determination. All outliers are influential data points. I only II only III only All of the None of the above Suppose a researcher conducts an experiment to test a hypothesis. If she doubles her sample size, of the following will increase? The of the hypothesis test. The effect size of the hypothesis test. The probability of making a Type II error. I only II only III only All of the above None of the above You conduct a hypothesis test and you observe values for the sample mean and sample standard deviation when n = 25 that do not lead to the rejection of . You calculate a p-value of 0.0667. What will happen to the p-value if you observe the same sample mean and standard deviation for a sample > 25? Increase Decrease Stay the same May either increase or decrease Remain constant What is the standard deviation for the data given: 5, 10, 7, 12, 0, 20, 15, 22, 8, 2 (mean 10.1) 6.89 10.1 7.26 9 5.26 Rome, November 24 2016 Answer corrector table: put a cross in correspondence to the selected answer N° a b c d e N° a b c d e
Statistic%20test%20december%202016-Giovanni-HP.docx