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Final

Week 11 Study Notes

2 Pages
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Department
Geography
Course Code
GGR270H1
Professor
Damian Dupuy

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GGR 270 Lecture 11 November 24, 2010
P- Value
Decision to reject or fail to reject h0 is made by comparing the test statistic to a
critical value of z or t
But, different significance levels may lead to different conclusions
To avoid ambiguity, some researchers prefer to use a variable level of significance P
value
Smallest value of a for which the h0 can be rejected
Actual risk of committing type 1 error
2 samples
In comparing 2 samples, if the sample means are significantly different, can
conclude they were drawn from different populations
2 sample difference of means test
Must examine difference in sample means
oIf sample difference is large, likely conclusion is the population means are
different
Need to know variances
oWe end up using 2 approaches according to whether we believe the variances
are equal or now
Both scenarios use T Statistic
Formulas
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Description
GGR 270 Lecture 11 November 24, 2010 P- Value Decision to reject or fail to reject h0 is made by comparing the test statistic to a critical value of z or t But, different significance levels may lead to different conclusions To avoid ambiguity, some researchers prefer to use a variable level of significance P value Smallest value of a for which the h0 can be rejected Actual risk of committing type 1 error 2 samples In comparing 2 samples, if the sample means are significantl
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