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REMEMBER! Type data tables in STAT EDIT. Use 4:LinReg(ax+b) for line of best fit Use 5:QuadReg for curve or quadratic of best fit Dr. M looked at gas prices for the last 5 years. Write an equation for the line of best fit. y = 0.55x + 3.15 y = 3.15x + 0.55 y = 2.295x + 0.127 y = 0.127x + 2.295 Dr. M looked at gas prices for the last 5 years. Based on the line of best fit you found, what will be the price of gas in 10 years? $2.75 $3.57 $3.95 $4.15 Determine the quadratic curve of best fit for the data. Hint: Type x-values in one column & y-values in the other. Use 5:QuadReg {(-3, 2), (0, 5), (1, 7.3), (-1, 3.3), (-6, 5), (-7, 7.3)} y = .33x2 + 2x + 5 y = .33x2 - 2x - 5 y = .33x2 + 2x - 5 y = .33x2 - 2x + 5 Use the curve of best fit you found to estimate the value of y when x = -4. Hint: Plug -4 into x {(-3, 2), (0, 5), (1, 7.3), (-1, 3.3), (-6, 5), (-7, 7.3)} 8.91 2.28 3.45 6.78 Anna offered to buy lunch for everyone in GW. She investigated the cost of a catered lunch for different numbers of people. What is the equation for the line of best fit? y = 4.5x + 75 y = 5.15x + 125 y = 6.25x + 125 y = 7.85x + 250 Use the line of best fit you just found to estimate how much Anna will pay for lunch for 50 people. Anna offered to buy lunch for everyone in GW. She investigated the cost of a catered lunch for different numbers of people. $352 $438 $479 $512 |