A regression relationship between weekly income (X) and weekly expenses (Y) has a linear equation of Y = 250 + 0.73 (X). The Y-intercept means ______________ Question 23 options: a) for every $0.73 increase in weekly income, we expect weekly expense to increase by $1.00. b) when weekly income is $250 we expected weekly expense to be $0.00. c) for every $1.00 increase in weekly income, we expect weekly expense to increase by $0.73. d) when weekly income is $250 we expect weekly expense to be $0.73. e) when weekly income is $0.00, we expect weekly expense to be $250