Use the following data to answer the next two questions: t ty t^2 1 60 2 55 3 75 4 60 5 80 6 75 1) Using simple linear regression, the intercept a is 48 O 62 O 34 0 54 10.8 Use the following data to answer the following question: t y ty t^2 1 60 2 55 3 75 4 60 5 80 6 75 il) Using simple linear regression the forecast for period 8 is 84.9 673 O 772 81 88.7