Question 864078
Hi

Calculator and/0r use of Electronic Worksheets Absolutely necessary

x	µ	(x-µ)	(x-µ)^2
86	520.8	-434.8	189051.04
135	520.8	-385.8	148841.64
250	520.8	-270.8	73332.64
357	520.8	-163.8	26830.44
447	520.8	-73.8	5446.44
553	520.8	32.2	1036.84
646	520.8	125.2	15675.04
769	520.8	248.2	61603.24
830	520.8	309.2	95604.64
1135	520.8	614.2	377241.640 Sum

5208			994663.600 sum/9 = V

			110518.178 sqrt V

		SD	332.443

Degrees of Freedom = n - 1 --> 10 - 1 = 9 + 2 tailed .10 (90% interval)

9.10 on t value table = 1.833

ME = 1.833*332.4/sqrt(10) = 192.69

CI: 520.8 - 192.69 < &#956; < 520.8 + 192.69   (328, 714)