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Analyzing Your Data. Was my difference caused by random factors?. Bob’s Data. Alice’s Data. Alice’s Data. Bob’s Data. Alice’s Data. Bob’s Data. Alice’s Data. C1 Standard Deviation: 2.05. C2 Standard Deviation: 0.82. Bob’s Data. Average Standard Deviation: 1.73.

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bob s data3

Alice’s Data

C1 Standard Deviation:

2.05

C2 Standard Deviation:

0.82

Bob’s Data

Average Standard Deviation:

1.73

Average Standard Deviation:

0.82

T1 Standard Deviation:

1.41

T2 Standard Deviation:

0.82

bob s data4

Alice’s Data

Effect Size > 1 = GOOD!

Bob’s Data

Average Standard Deviation:

1.73

Average Standard Deviation:

0.82

1 / 0.82 =

1.22

Effect Size = 1.22

1 / 1.73 =

.58

Effect Size = .58

bob s data5

Alice’s Data

http://vassarstats.net/tu.html

Bob’s Data

For Bob’s Data

For Alice’s Data

bob s data6

Alice’s Data

http://vassarstats.net/tu.html

Bob’s Data

p = .22

.22 > .05

(22% probability that Bob’s results are due to chance)

p = .01

.01 < .05

(1% probability that Alice’s results are due to chance)