Regression: Introduction Instructions: Use the interactive tool as directed to answer the questions below. Interact with the above tool as instructed, and observe what happens to answer the following questions. Choose data set #1 by typing "1" into the first box. Then click anywhere else in the tool to see a scatterplot of the data. A solid blue line is drawn at the mean of the y values. a. Describe what happens when you move the "intercept" slider to the right. multiple choice 1 The labels on the vertical axis shift upward. All of the data points shift upward. All of the data points shift downward. The blue line shifts upward. The blue line shifts downward. b. Describe what happens when you move the "slope" slider to the left. multiple choice 2 The data points shift to the right. The labels on the horizontal axis shift leftward. The blue line rotates and becomes more upward sloping (or less downward sloping). The blue line rotates and becomes more downward sloping (or less upward sloping). The data points shift to the left. c. Set the "Slope" to 0.8, and then toggle between the two "Show..." buttons above the scatterplot. Describe what happens to the dotted lines when you click these buttons. It may help to focus on a single data point when you click a button. multiple choice 3 One endpoint is always at the horizontal line. The other endpoint moves between the sloped, blue line and the data point. One endpoint is always at the blue line. The other endpoin