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Question

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 bivariate data is shown below,

Number of Pages (xx)Cost(yy)
233	31.3
921	109.1
685	80.5
947	108.7
983	113.3
343	50.3
487	70.7
846	110.6
619	71.9

Click to Copy-and-Paste Data

x: 233,921,685,947,983,343,487,846,619

y: 31.3,109.1,80.5,108.7,113.3,50.3,70.7,110.6,71.9

A student calculates a linear model

yy =  xx + . (Please show your answers to two decimal places) 

Use the model above to estimate the cost when number of pages is 891 

Cost = $ (Please show your answer to 2 decimal places.)

Answer 1

ŷ = 0.10631X + 11.30436

for x = 891, ŷ = 106.0261