Asked by Zameer
A population of values has a normal distribution with μ=76.6 and σ=43.9
You intend to draw a random sample of size n=142.
Find P75, which is the score separating the bottom 75% scores from the top 25% scores.
You intend to draw a random sample of size n=142.
Find P75, which is the score separating the bottom 75% scores from the top 25% scores.
Answers
Answered by
PsyDAG
Z = (score-mean)/SEm
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.75) and its Z score. Insert data into first equation and solve for score.
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.75) and its Z score. Insert data into first equation and solve for score.
Answered by
PsyDAG
That would be for finding the distribution of means. Use the equation:
Z = (score-mean)/SD
Z = (score-mean)/SD
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