construct a 90% confidence - 8

Statistics
Tutor: None Selected Time limit: 1 Day

Apr 8th, 2015

given mean(x)=114

standard deviation(s)=18.1

population(n)=45

Z statistic value for 90% confidence limits is 1.645

lower limit= x-s*Z/(n)^0.5

=114-18.1*1.645/(45)^0.5=114-4.438=109.56

upper limit= x+s*Z/(n)^0.5

=114+4.438=118.438


Apr 8th, 2015

hello - it was 2 parts to this queston. 90% and 95%. What is the answer for 95%?

Apr 8th, 2015

one minute

Apr 8th, 2015

for 95%

Z=1.96

upper limit=114+5.288=119.52888

lower limit=114-5.288=108.711

Apr 8th, 2015

hmmm they said the answer was wrong.

Apr 8th, 2015

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