My Math Forum Equation of the line of best fit

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 June 15th, 2010, 08:50 AM #1 Newbie   Joined: Jun 2010 Posts: 5 Thanks: 0 Equation of the line of best fit ok, I was given the table and it wants the equation of the line of best fit and the correlation coefficient please help me.... table: Photos Taken: 117, 128, 140, 157, 110, 188, 170 Photos Kept: 25, 31, 39, 52, 21, 45, 42 I know for line of best fit, the two set of points have to be taken from what is on the line of best fit, and I believe you use the point slope formula. Please help, this will be most likely my last question of the day
 June 15th, 2010, 09:12 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,919 Thanks: 2202 This is a very poor question. Do you have a calculator that provides statistical functions?
June 15th, 2010, 09:17 AM   #3
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Quote:
 Originally Posted by skipjack This is a very poor question. Do you have a calculator that provides statistical functions?
Not on me now, what do you mean it's a very poor question?

 June 15th, 2010, 10:32 AM #4 Global Moderator   Joined: Dec 2006 Posts: 20,919 Thanks: 2202 The use of a "best fit" concept suggests that there is a relationship between two variables, as does the use of "Photos Taken" and "Photos Kept", but you're not told whether these are connected at all beyond being given in the same table. If the data were plotted, how would you do that, and what would you think if the points plotted didn't appear to lie near any particular line? In what sense does a line "fit" points if those points must have integer coordinates? In other words, are values "predicted" by the line to be rounded to the nearest integer? Would you assume that any value for "Photos Taken" must not be less than the corresponding value for "Photos Kept"? What would you expect the "correct" answers to be if the table contained only one pair of values? Same question if there are only two pairs of values. Since you can connect any two distinct points with a line, is there any relationship based on two distinct points?

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