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Lecture 5

CHEM 212 Lecture 5: Sept 16/2016

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University of Victoria
CHEM 212
Hamilton M.Coreen

Chem 212 Lecture 5 Sept. 16/2016 Graded assignment, identical question in class. Sometime next week Finish worksheets this weekend**** Stats continued... -Stats test testing if there is a difference or not -at higher level confidence we need much stronger evidence -Testing the null-hypothesis Ho - xbar and mu are not significantly different and can be explained by random error alone -testing whether the difference is real or not -t value is the value expected only from only random error -Setting up the t-test 1. Calculate t-cal= |38.1-33.56|*(5^1/2/3.15)=3.2 2. Look up table: for d.f.=5-1 3. t-table=2.78 at 95% conf & t-table=4.60 at 99% 4. Conclude: There is a significant difference at 95% There is not significant at 99% The stronger evidence is saying there is something else going on rather than just random error. Your tcalc tells you if you can reject the null hypothesis that says there is no difference besides random error Steps for conducting a t-test: 1. calc xbar and s 2. Calculate talc 3. look up t-table based on d.f. and desired level of confidence 4. compare talc and table 5. make conclusion A. if t-calc>t-tbale there is a significant difference at the selected confidence interval B. t-calc
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