Question 314610
You really should do this exercise in EXCEL.
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a){{{drawing(300,300,-10,60,-2,10,
circle( 30,2.85,.5 ),
circle( 50,6.5, .5 ),
circle( 34,1.5, .5 ),
circle( 12,6.35, .5 ),
circle( 37,6.2, .5 ),
circle( 33,6.75, .5 ),
circle( 36,3.6, .5 ),
circle( 26,6.1, .5 ),
circle( 18,8.35, .5 ),
circle( 46,4.35, .5 ),
graph(300,300,-10,60,-2,10,-0.053x+6.9609))}}}
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b) {{{y=-0.053x+6.9609}}}
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c) Looking at the cloud of data there does appear to be a slight downward slope as reflected in the slope value, {{{m=-0.053}}}
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d) Not really in this instant, it would be the amount of money spent by a newborn (age=0). That would most likely be $0.00. 
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e) The data do not provide a good fit of data as shown with a correlation coefficient of 
{{{r^2=0.0851}}}.
A value of 1 would be a perfect fit, the closer to 1 the better, this value is very far from one. A linear model is not a good choice to model this data.