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)

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answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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