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Why do statistics?
· Psychology involves testing theories through
research
· You need to be able to analyse your data to
see if your results support your hypothesis
· Statistical tests mean you don't have to make
decisions about this- they decide!…read more

Slide 3

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SPEEDY POP
Imagine you have designed a drink that you
say improves running speed. You have to
produce research to support this view…read more

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How would you test your drink?
· Conduct a study where ps run a race without
the drink and after the drink and time their
running
· It is not always easy to see if the drink has had
an effect.
· Running times will always be different due to
chance- so how do we know if the drink has
had an effect…read more

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Test 1 ( Difference is big enough to
presume speedy pop works!!)
Condition 1: No Condition 2:
Energy Drink Energy Drink
Mean times of 15.8 seconds 11.2 seconds
100 metres race…read more

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Test 2 (Difference is very small so
has speedy pop worked?)
Condition 1: No Condition 2:
Energy Drink Energy Drink
Mean times of 11.8 seconds 11.2 seconds
100 metres race
Statistics enable a decision about whether the drink really
improves performance or whether it is just chance variation…read more

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