Statistics question:
we intended to estimate the average driving time of a group of com...
Mathematics, 19.12.2019 23:31 22mhenton
Statistics question:
we intended to estimate the average driving time of a group of commuters from a previous study, we believe that the average time is 42 minutes with a standard deviation of 12 minutes. we want of 99 percent confidence interval to have a margin of error or no more than plus or minus 3 minutes. what is the smallest sample size we should consider?
ok, so
n = 42 minutes
stand. deviation = 12
confidence interval = .99
alpha = .005
z-score = +- 2.575 (i think)
and e = +-3
what?
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