Statistics question 9.5 #2

Statistics
Tutor: None Selected Time limit: 1 Day

Apr 23rd, 2015

Decision Rule: Reject Ho if z <-2.58 or z>2.58

i am not sure if sd=1.9 or 4.9 so i computed both cases.

z=(26.2-26)/1.9/sqrt(240)=1.63

z=(26.2-26)/4.9/sqrt(240)=.63

Fail to reject Ho.

Apr 23rd, 2015

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