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33

F statistic

Within group variability

individual differences

measurement error

Between group variability

treatment effects

individual differences

measurement error

These two variabilities are independent of one another

They combine to give total variability

We are mostly interested in between group variability because we are trying to understand the effect of the treatment

Qwerty

Dvorak

Alphabetic

Keyboard

5, 9, 7, 6,

3, 7

3, 9, 11, 2,

3, 10

3, 5, 5, 4,

2, 5

Qwerty

Dvorak

Alphabetic

Keyboard

3, 5, 5, 4,

2, 5

3, 9, 11, 2,

3, 10

5, 9, 7, 6,

3, 7

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