Posted by Brittany on Thursday, April 19, 2012 at 8:18pm.
What is the highest raw score possible?
Is that the lowest 30th percentile? Or is it the lowest 30 percent of the total score?
I guess 100 is the highest the mean is 30.9 and the standard deviation 2.08 it just says children below the 30th percentile
Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.30) and its Z score. (Pay attention to the sign.) Insert Z and other values in equation above to find the cutoff score.
Please advise-Thank you.
The Center for Urban Transportation research released a report stating that the average commuting distance in the United States is 10.9 miles Suppose that this average is actually the mean of a sample of 300 commuters and that the sample deviation was 6.2 mi. Estimate the true mean commuting distance using a 99% confidence interval.
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