A random sample of testimonials for texting and driving videos and number of car crashes was measured, and the computer output for regression was obtained: Coefficients Standard Error t Stat P-value
Intercept 9.983566646 1.400031473 7.130959 0.002045
Testimonials −0.119902617 0.038348632 −3.12665 0.035299

R-sq. = 70.96% R-sq.(adj) = 63.70%

Part A: Use the computer output to determine the LSRL. Identify all the variables used in the equation. (3 points)
Part B: What proportion of the variation in car crashes is explained by its linear relationship to video testimonials? Explain. (4 points)
Part C: Determine if decreased accidents were caused by texting and driving videos. Explain your reasoning. (3 points)