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April 24, 2014

April 24, 2014

Posted by **bren** on Tuesday, December 8, 2009 at 4:30pm.

face and then a picture of either a gun or a tool. The task was to press one button

if it was a tool and a different one if it was a gun. Unknown to the participants

while they were doing the study, the faces served as a “prime”

(something that starts you thinking a particular way) and half the time were of a

black person and half the time of a white person. Table 2–8 shows the means

and standard deviations for reaction times (time to decide if the picture is of a

gun or a tool) after either a black or white prime. (In Experiment 2, participants

were told to decide as fast as possible.) Explain the results to a person who has

never had a course in statistics. (Be sure to explain some specific numbers as

well as the general principle of the mean and standard deviation.)

8 Mean Reaction Times (in Milliseconds) in Identifying

Guns and Tools in Experiments 1 and 2

Prime

Black White

Target M SD M SD

Experiment 1

Gun 423 64 441 73

Tool 454 57 446 60

Experiment 2

Gun 299 28 295 31

Tool 307 29 304 29

- statistics -
**PsyDAG**, Wednesday, December 9, 2009 at 1:38pmSince you don't indicate what test(s) you are using, it is harder to explain.

Is the variation in means or standard deviations significant or due to chance? That would be a good starting point.

The teacher wants to know if you understand what is happening. If you can explain something clearly to others, this indicates that you understand. Do you?

I hope this helps.

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