Question

The "line of best fit" for a scatterplot must pass through at least _____ of the data points in the data set.
A.0
B.1
C.2
D.3

Answer 1

none of them really; its a sort of mean or average; and those dont need to be apart of the set

Answer 2

th eline of best fit MUST use the average X and Y values in its construction; but that average maynot necessarily be any of the stated points

Answer 3

for example:

x y xy
0 0 0
1 2 2
2 5 10
---
12

sum x sumx = 9
sum y sumy = 49
sumx sumy = 21

avgX = 1
avgY = 7/3

m = 3(12) - 21
--------- = 3/2
3(5) - 9

y = 3/2 (x-1) + 7/3 should be the line of best fit for those 3 points

Answer 4

oh okay thanks c:

Answer 5

yep

Answer 6

Tell whether the lines for each pair of equations are parallel, perpendicular, or neither.

y = 5x
y = -5x + 7
a.
parallel
b.
neither
c.
perpendicular

Answer 7

can u help