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1 Matched pairs t-tests • Paired observations reduced independence of observations • Matched pairs t-test (x 11 , x 12 , …, x 1n ) (x 21 , x 22 , …, x 2n )

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Matched pairs t-tests. (x 11 , x 12 , …, x 1n ) (x 21 , x 22 , …, x 2n ). Paired observations  reduced independence of observations Matched pairs t-test. | d |. t test =. s d. S (d i - d) 2. S d =. n. n - 1. Matched Pairs t-tests. - PowerPoint PPT Presentation

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Page 1: Matched pairs t-tests

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Matched pairs t-tests

• Paired observations reduced independence of observations

• Matched pairs t-test

(x11, x12, …, x1n)

(x21, x22, …, x2n)

Page 2: Matched pairs t-tests

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Matched Pairs t-tests

ttest =| d

sd

n

(di - d)2

n - 1Sd =

Page 3: Matched pairs t-tests

3

Source: http://cdiac.ornl.gov/epubs/ndp/ushcn/state_NC_mon.html

Page 4: Matched pairs t-tests

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Source: http://cdiac.ornl.gov/epubs/ndp/ushcn/state_NC_mon.html

Page 5: Matched pairs t-tests

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2001 is significantly drier than 2000 in central North Carolina.


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