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AP®︎/College Statistics

Lesson 4: Least-squares regression

Using least-squares regression output

Janine noticed a linear relationship between the size of a diamond (in carats) and its price (in dollars) in a random sample of

64

diamonds. Here is computer output from a least-squares regression analysis on her sample for using size to predict price:

Predictor	Coef	SE Coef	T	P
Constant	$8.00$ ‍	$60.76$ ‍	$0.13$ ‍	$0.90$ ‍
Carat	$2722.34$ ‍	$259.92$ ‍	$10.47$ ‍	$0.00$ ‍
$S = 132.30$ ‍	$R-sq = 63.9 %$ ‍

Which of these is an appropriate least-squares equation for this model?

Stuck?