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A researcher records the following response times to a visual stimulus: 23 ± 3.1 ( M ± SD) s. Assuming these data are normally distributed, what is the probability that participants responded in 20 s or less

Respuesta :

obasola1

Answer:

0.1666

Step-by-step explanation:

A researcher records the following response times to a visual stimulus: 23 ± 3.1 ( M ± SD) s. Assuming these data are normally distributed, what is the probability that participants responded in 20 s or less

z=X-U/SD

z=(20-23)/3.1

z=-0.9677

checking the negative part of the z score table. we go to

-0.97

that is -0.9 under 0.07

the value we get is 0.1666

P(x<20) means that P(z<-0.97)

0.1666

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