Question

18 

Statistics students in Oxnard College sampled 10 textbooks in the Condor bookstore and recorded the number of pages in each textbook and its cost. The bivariate data are shown below:

Number of Pages ($x$)	Cost($y$)
325	62
296	57.52
843	124.16
469	68.28
885	134.2
997	133.64
775	119
983	141.96
440	64.8
207	51.84

A student calculates a linear model
$y$ =  $x$ + . (Please show your answers to two decimal places)
Use the model to estimate the cost when number of pages is 545.
Cost = $ (Please show your answer to 2 decimal places.)

17

Statistics students in Oxnard College sampled 9 textbooks in the Condor bookstore and recorded the number of pages in each textbook and its cost. The data are shown below:

Number of Pages ($x$)	Cost($y$)
920	67.2
759	59.54
678	64.68
598	54.88
527	42.62
900	73
801	61.06
524	53.44
557	47.42

A student calculates a linear model using technology (Statistics Calculator or Computer)
$\hat{y}$ =  $x$ + . (Please show your answers to two decimal places)
Use the model to estimate the cost when number of pages is 222.
Cost = $ (Use the linear model with yor rounded coefficients and then round your answer to 2 decimal places.)