Question 624271
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Hi,
 SD = 3.09
 (A) How many measurements should be made in order to be 95% certain that the maximum error of estimation will not exceed 1.5 seconds? 
 ME = {{{1.96*(3.09/sqrt(n)) = 1.5}}} solve for n
(B) What sample size is required for a maximum error of 0.5 seconds? 
 ME = {{{1.96*(3.09/sqrt(n)) = .5}}} solve for n