a) Consider the following linear model: ? = a + 2

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a) Consider the following linear model: ? = a + 2.3x

This linear model forecasts total book sales (in 1,000s) given the total amount of pre-order sales (in $1000) identifies by variable x. Calculate the value of the intercept (y-intercept) given that if the amount of pre-order sales is $500 then the predicted sales volume is ? = 9400 unites. (only round final answer to 1 decimal place)

b) Assuming y is the dependent variable and x is the independent variable in a linear relationship, find the R² of the relationship if b₁ = -0.8, s_y = 3.4, and s_x = 1.3 (round intermediate numbers to 4 decimal places and final answer to 2 decimal places)