Homework SourseIn the answer boxes below the table provide the values for t
In the answer boxes below the table, provide the values for the table cells that have question marks.
Row a).
_______ intercept
_______ slope
Row b).
_______ intercept
_______ slope
Row c).
_______ xbar
_______ r
Row d).
_______ xbar
_______ sx
| xbar | sx | ybar | sy | r | intercept of least sq. line | slope of least sq. line | |
| a) | 30 | 4 | 18 | 6 | -0.2 | ?? | ?? |
| b) | 100 | 18 | 60 | 10 | 0.9 | ?? | ?? |
| c) | ?? | 0.8 | 50 | 15 | ?? | -10 | 15 |
| d) | ?? | ?? | 18 | 4 | -0.6 | 30 | -2 |
Solution
slope= r Sy/Sx
15= r 15/0.8
r = 0.8
y-intercpet = ybar - slope*xbar
-10 = 50 - 15* xbar
15 xbar = 50+10 = 60
xbar = 60/15 = 4
for Row C , xbar = 4 and r = 0.8
4. for Row d
slope = r Sy/Sx
-2 = -0.6*4/Sx
Sx = -2.4/-2 = 1.2
y-intercpet = ybar - slope*xbar
30 = 18 + 2* xbar
2 xbar = 30 - 18 = 12
xbar = 12/2 = 6
for Row d xbar = 6 and Sx = 1.2
this may help u
