A random sample of online music video views and number of guitar sales was measured, and the computer output for regression was obtained: R-sq. = 69.73%R-sq. (adj) = 63.68%

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 of guitar sales is explained by its linear
relationship to music video views? Explain. (4 points)

Part C: Determine if increased guitar sales were caused by online music video views.
Explain your reasoning. (3 points)

Intersecting secant-tangent theorem states that if a tangent segment and a secant segment are drawn to a circle from an exterior point, then the square of the measure of the tangent segment is equal to the product of the measures of the secant segment and its external secant segment.so to break it down: 1. pq acts as the tangent and ps as the secant with an intersection at p.sr = 21rp = 3x + 3pq = 4x + 4following to equation: tangent squared = the two segments multiplied by each otherso (4x + 4) ^ 2 = (3x + 3) • (21) simplifies to 16x^2 - 31x - 47 = 0 or (16x - 47)(x + 1) x = -1 or x = 47/162. pq acts as the tangent and ps as the secant with an intersection at p (again! )sr = 16rp = xpq = 15(15) ^ 2 = 16 • x225 = 16xx = 225/163. the interesting chords are proportional to each other so a ratio is possible to set up: ap dp 10 3 + x = = —— = pc pb 8 xcross multiple to get 10x = (3 + x)(8)x = 12