Statistics questions

Statistics
Tutor: None Selected Time limit: 1 Day

Mar 7th, 2015

First, find the critical value of Z for an 85% confidence interval:

Norm.inv ( 0.925, 0, 1 ) = 1.44

Remember that the margin of error will be given by Z_crit x standard error:

Margin of error  = 1.44 x sd/sqrt(n)

Rearrange in terms of n:

sqrt(n) = 1.44 x sd / Margin of error

n = [ 1.44 x 1.7 / 0.11 ] ^2

= 495


Mar 7th, 2015

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