What is the observed cost for a set containing 213 pieces? Note the Cursed Cobra Statue has 213 pieces. . What is the residual for this point? If you were going to calculate the sum of squared residuals for this line, how many residuals would you need to calculate? Finding which line is the regression line can be difficult to compute by hand. You have a sheet that shows multiple ways to calculate the regression line. We will look at Statkey. In order to find a regression line in Statkey complete the following steps. Go to http://www.lock5stat.com/StatKey/. Click on 2 quantitative variables. Click on Edit data. Enter the date (The image shows what the form of the data should look like). Click OK. Click on Show regression line. When using Statkey, you always want to do some quick checks to make sure that the date was entered correctly. Look at the plot. Are the explanatory and response variable correct? If they are switched, you can click on "switch variables" to fix. Look at the sample size. Does the sample size match the number of data points in your data? You should have 9 data points. 4. Use the output to determine the correlation between these two variables. What is the appropriate symbol for the correlation coefficient? 5. Write out the equation of the regression line using the intercept and the slope from the output