We have the following data:
X: 18, 15, 28, 16, 29, 38, 48, 17, 24, 50, 32
Y: 7.2, 3.5, 6.6, 5.4, 1.5, 2.3, 4.4, 8.8, 4.9, 3.0, 7.8
We calculate the following sums:
$\sum X = 305$
$\sum Y = 55.4$
$\sum X^2 = 10241$
$\sum Y^2 = 336.36$
$\sum XY = 1626.6$
$n =
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