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27 September, 21:42

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

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  1. 27 September, 22:08
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    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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