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July 23, 2014

July 23, 2014

Posted by **cb** on Sunday, November 14, 2010 at 10:05pm.

and standard deviation 1.4.

a. What is the distribution of Xbar, the mean number of accidents in one year, (52

weeks)? {Note you do not have to use R for this question, write down the

distribution with parameters here and then proceed]

b. What is the probability that Xbar is less than 2?

c. What is the probability that Xbar is between 5 and 20?

d. What is the probability that there are fewer than 100 accidents in a year?

- statistics -
**PsyDAG**, Monday, November 15, 2010 at 9:43amYou are dealing here with a distribution of means rather than raw scores.

The standard error of the mean (SEm) = SD/√(n-1)

Would n = number of weeks?

Z = (score-mean)/SEm

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 scores.

100 accidents/year = 1.923/week

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