BASIC CONCEPTS in CORRELATION and REGRESSION. 1A. Do this first activity together as a class led by your instructor. Using Chrome or Firefox please open Two Quantitative Variables app at: www.rossmanchance.com/applets/2021/regshuffle/regshuffle.htm 1. Use default data FootHeight. (Height is the Response var; Footlength the Explanatory variable.) From the scatterplot describe the direction and strength of the correlation: 2. Guess the correlation coefficient. I think r = 0.60 then click Correlation coefficient box to see the true r-value. r = 0.711 click R-squared - this tells us how much of height is predicted by foot size. R2 = 0.506