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SCAN0005

# SCAN0005 - What is the 95 CL for the lifetime of a light...

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Unformatted text preview: What is the 95% CL for the lifetime of a light bulb? We cannot measure true pop. mean u or pop. deviation 6 We determine sample meanYand sample dev. SX CI expression says “true mean u is likely to lie in certain distance from measured mean? Y: 845.2 hrs SX = 94.2 hrs, n=60 and n=1000 3x = 47.1‘ hrs, n=1ooo Using Statistics to Compare Data - Q test for bad data - F test for oomparable 8 between data sets - T test to compare a data set — vs. a known standard — vs, another data set — vs. another method Case 1. T-test to compare a data set to a known standard A mal sample was certiﬁed to contain 3.19 wt% sulfur. A new analytical methud. which you are testing. gives yuu 3.19.122, 3.30. and 3.23 wt% sulfur‘ Dues your analyxil agree with the certiﬁed results at 95% level «I conﬁdence? IY—pl r l = cal S; " If tnil > tcm, then the result is different from the known value at the 95% level of conﬁdence. The chance that you have made a mistake is < 5% ...
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