ࡱ> { d#bjbjzz $$&2&2&2&2&2:2:2:28r2\2 :2{]365&5&5&5KKK\\\\\\\$Y_ b ]&2KK"KKK ]&2&2&5&55]YNYNYNKv&2&5&2&5\YNK\YNYNnX[&50rBSL6*[ \K]0{]J[bMb@[[b&2[KKYNKKKKK ] ]YNKKK{]KKKKbKKKKKKKKK$ 0: Worksheet for Correlation and Regression (February 1, 2013) Part 1. Consider the following hypothetical data set. Here are data from four students on their Quiz 1 scores and their Quiz 5 scores and a graph where we connected the points by a line. ( EMBED Equation.DSMT4 ) (Fake) Data on Quiz scores: x y Quiz 1 Quiz 3 0 5 3 6.5 6 8 8 9 Identify each of these points on the graph.  Notice that this is an exact linear relationship, as we had in algebra classes. We need to review this before going on to learn about approximate linear relationships, as we will see in statistics classes. Fill in the following table of some predicted Quiz 5 scores. x y Quiz 1 Quiz 5 0 1 2 3 4 6 8  Interpretations of the slope and y-intercept: If EMBED Equation.DSMT4, then the predicted value of y is the y-intercept. (The y-intercept here is 5.) If x increases by 1, then we predict that y will increase by b. (The slope here is 0.5.)  The equation of this line is  EMBED Equation.DSMT4 . So the slope is 0.5 and the y-intercept is 5. Interpret the y-intercept in context. (Write a sentence about Quiz 1 and Quiz 5 score relationship using the y-intercept.) Interpret the slope in context. (Write a sentence about the Quiz 1 and Quiz 5 score relationship using the slope.) Part 2 Data: In EESEE, an experiment is described in which they want to predict Blood Alcohol Content from the number of beers. Volunteer college students (some men and some women) are assigned a certain number of beers to drink and then, after a half an hour, their Blood Alcohol (BAC) level is measured. (In our text, the full dataset is in Ch. 24 beers and is the example on making predictions of BAC from Beers. For this handout, for ease of calculation, we will use only the first six of these data points.) BeersBAC50.120.0390.1980.1230.0470.095 1. In the blank space above, put labels x and y above the appropriate columns. Then quickly sketch a scatterplot appropriate to investigate whether how BAC depends on the number of beers consumed. 2. Guess what r is. (Is it positive or negative? Is it close to zero or close to positive or negative one?) 3. For each variable (x and y) find the mean and standard deviation. On homework and quizzes, use software (Minitab or CrunchIt) to compute the standard deviations. On tests, you won't have to compute the standard deviations. EMBED Equation.DSMT4 EMBED Equation.DSMT4EMBED Equation.DSMT4 2.80 EMBED Equation.DSMT4 0.05824. On homework and quizzes, use Minitab or CrunchIt to compute the correlation coefficient. On tests, you won't have to compute the correlation coefficient. For these data, we have r = 0.927. Is this consistent with your guess? 5. On your scatterplot, guess where you would draw a line that comes close to describing the data. Do a very light sketch of it. You will compare your guessed line with the one you actually compute below. 6. On homework, quizzes and tests, be able to compute the equation of the regression line by hand, using a scientific calculator, using these formulas. On homework and quizzes, use this often enough to learn to do it for the test. You may use the computer to find the equation of the regression line on most homework and quiz problems. Compute the slope and intercept of the regression line. Slope: EMBED Equation.DSMT4y-intercept: EMBED Equation.DSMT4 7. Write the equation of the regression line usingEMBED Equation.DSMT4. (You write this, but put in your computed values for a and b. The hat on the y means that this is a predicted value for y, which isnt necessarily the same as a value for y in the data itself.) 8. Use the equation of the regression line to predict BAC twice, for 4 beers and 8 beers: EMBED Equation.DSMT4 EMBED Equation.DSMT4EMBED Equation.DSMT4 EMBED Equation.DSMT4 9. Using a different colored pencil, put these two points you just computed on your graph and then draw a line through them. This is the graph of the regression line that you just computed. Does it look pretty close to the line you guessed? 10. Compute the residual for EMBED Equation.DSMT4. (The residual is the difference between the observed y value and the predicted y value.) 11. Use the line you drew to predict y when EMBED Equation.DSMT4. Write your prediction here. 12. Identify and interpret the regression coefficients, in context. y-intercept: Slope: -------------------------------------------------------------------------------------------------- Variable N N* Mean StDev Beers_6 6 0 5.67 2.80 BAC_6 6 0 0.0958 0.0582 Pearson correlation of Beers_6 and BAC_6 = 0.927 The regression equation is BAC_6 = - 0.0132 + 0.0192 Beers_6 Variable N N* Mean StDev Beers 16 0 4.813 2.198 BAC 16 0 0.0738 0.0441 Pearson correlation of Beers and BAC = 0.894 The regression equation is BAC = - 0.0127 + 0.0180 Beers Part 3. Using software. 13. Use Minitab and our course software page to find this dataset in Chapter 5, called beers_6 a. Make a scatterplot. b. Find the correlation coefficient c. Use Stat > Regression > Fitted Line Plot to find the regression equation. d. Use Stat > Regression > Regression to find the regression equation. 14. Use Minitab and our course software page to find the full dataset, in Chapter 5, called beers.txt Use Stat > Regression > Regression to find the regression equation AND predict BAC when beer is 5. To predict the values, use Options and then type in the x value of your variable there. Use Stat > Regression > Regression to find the regression equation AND make a residual plot of the residuals versus the explanatory variable. To make the residual plot, use Graphs and then type in the name of the explanatory variable. At home: Read Chapter 5 and work the problems at the end of each short section as you go through them. We will spend the next class finishing our discussion of Chapter 5. Important note about homework. Sometimes you will need to have a scatterplot with a regression line plotted on it. You can get that with Stat > Regression > Fitted Line Plot. 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