Math 1272 - Mean/Standard Deviation calculations - Days 3/5 handouts

	B	C	D	E	F	G	H	I	J
1		Quiz score data						Company age data sets
2		x	deviations: x - mu	squared deviations: (x - mu)^2		x^2		Company 1	Company 2
3		8	2	4		64		47	70
4		3	-3	9		9		38	39
5		2	-4	16		4		36	18
6		7	1	1		49		40	46
7		10	4	16		100		37	27
8		9	3	9		81		42
9		10	4	16		100		38
10		0	-6	36		0		42
11		9	3	9		81
12		8	2	4		64
13		3	-3	9		9	Sigma x =	320	200
14		2	-4	16		4	N =	8	5
15		5	-1	1		25	Mean mu =	40	40
16		4	-2	4		16
17		10	4	16		100
18
19	Sigma x =	90	sum of squares SS_x =	166		706
20	N =	15
21	Mean mu =	6	variance sigma^2 =	11.07	sample var	11.85714286
22			standard deviation sigma =	3.33	sample std dev	3.443420227
23
24	Check: mean mu directly via "average" function:	6	Check: std dev directly via "stdevp" function:	3.33	Check using "var"	11.85714286
25					check using "stdev"	3.443420227
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