Given the following data, use least-squares regression to derive a trend equation: D Period Demand 1 2 3 4 5 6 9 12 10 6 5 15 The least-squares regression equation that shows the best relationship between demand and period is (round your responses to two decimal places): *0+0= where y Demand and x Period. What is your estimate of the demand in period 7? Estimated demand in period 7 is (round your response to two decimal places). What is your estimate of the demand in period 12? Estimated demand in period 12 is (round your response to two decimal places).