Answer Happy

Talk this way - To investigate the relationship between diversity and performance in the world's top soccer league, the authors of a paper looked at data from the UEFA Champions League, which is one of the elite soccer leagues in the world. Using information about each player on each team, they created a variable called Diversity, which measured how different the languages spoken by the players on the team are. For each team, they also calculated the variable Differential, which represents the number of goals scored minus the number of goals conceded over the course of the Champions League's season. The data below is consistent with the results found by the authors. A sample of 45 teams is selected. The correlation between Diversity and Differential was found to ber = 0.2185. The scatter plot and a summary of the data is given below. Round all calculated answers to 4 decimal places. Super Elite Soccer League Teams 2.0 Differential 1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 30 40 50 60 70 BD Diversity
Variables Mean Sample SD 56.9 13.5 Diversity Differential 0.3 0.85 1. Calculate the slope and intercept for the linear regression equation that predicts Differential from Diversity. Note: Do not use rounded values for intermediate calculations! Slope: and Intercept: 2. What is the R2 for this study's linear regression model of Differential from Diversity? 3. As part of their analysis, the authors examine the residuals for the regression model to determine if the conditions for linear regression have been met. Which condition are the authors checking with the following plot?
3. As part of their analysis, the authors examine the residuals for the regression model to determine if the conditions for linear regression have been met. Which condition are the authors checking with the following plot? Residuals vs. Fitted Values 은 -1.5 -1.0 -0.5 0.0 0.2 0.4 0.6 Fitted Values O A. The authors are checking to see if there is strong evidence that the slope of the regression line is nonzero. OB. The authors are checking to see if the variability of points around the least squares line is roughly constant. C. The authors are checking to see if the slope of the regression equation is positive or negative.
4. The next year, a soccer fan wants to use these results for a team playing in the current tournament. He calculates the diversity of this team this year to be 65.69. Is it appropriate for the fan to use the regression equation to estimate the goal differential for this team this year? ??? v because A. Regression equations can only be used to calculate predicted values for the year the model is created. B. The regression model is only valid for the 45 teams used to create the model. C. The value for diversity for the new team is not within the range of the data used to create the model. D. The value for diversity for the new team is within the range of the data used to create the model.