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Commuters were asked how many times a week they stop for coffee on their way to work. A survey found a mean of 3 times a week w...Asked by brewser
Commuters were asked how many times a week they stop for coffee on their way to work. A survey found a mean of 3 times a week with a standard deviation of 0.55. Find the probability that the sum of 100 values is more than 290.
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Answered by
PsyDAG
Z = (score-mean)/SEm = (2.9 - 3)/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 related to the Z 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 related to the Z score.
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