Question

I need help calculating sum of squares of x given the following data as well as the SSxy

13. Calculate SS.x for the following data. Do this however you need to. 20 10 4 12 13 13 12 14. Calculate SSy for the data in question 13.

Answer 1

13) In this part, we have to find SSxx for the data.

Here n = 6

Formula is

$SSxx=\sum x^{2}-\frac{(\sum x)^{2}}{n}$

	x	y	x^2
	10	4	100
	11	5	121
	12	6	144
	13	4	169
	13	7	169
	12	2	144
Total	71	28	847

$SSxx=\sum x^{2}-\frac{(\sum x)^{2}}{n}=847-\frac{71^{2}}{6} =847-840.1667=6.8333$

14) Now in this part, we have to find SSxy

Formula is

$SSxy=\sum xy-\frac{\sum x\sum y}{n}$

	x	y	xy
	10	4	40
	11	5	55
	12	6	72
	13	4	52
	13	7	91
	12	2	24
Total	71	28	334

$SSxy=\sum xy-\frac{\sum x\sum y}{n}=334-\frac{71*28}{6}=334-331.333=2.6667$