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(years since 1933) 20 31 38 54 64 75 87 P(!) 19.91 14.71 9.69 8.35 (in dollars) 6.39 2.28 1.61 1.20 1.00 1. The purchasing power of the US currency is the amount of goods and services that can be bought with one US dollar. The function P gives the purchasing power on one US dollar based on the value of a dollar in the year 2020. The table above presents values for the function P at selected values of , where / is the number of years since 1933. P(() can be modeled by the exponential regression y= 21.682(0.963) , where ? is the number of years since 1933 (A) (i) Find the value of P(54) predicted by the exponential regression model. (ii) Find the residual value of the purchasing power of the US currency when / = 54. Does this residual value indicate that our model overestimated or underestimated the purchasing power of the US currency when 1=547 Give a reason for your answer. (B) (1) The function /'( / ) can also be modeled with a linear model. Let y = a + bix be the linear regression model for P(1 ). Use the data in the table to find the linear regression model for P() W Find the value of P( 20) predicted by the linear regression model