Answers
Complete solution for the problem can be found in the images below with all the necessary steps. 
The 100(1-027 Confidence interval for population mean (ie true mean) from the Cone-sided interval al), is! .
X Sod () re Za Za? s). where sid(X) z Standard deviation estimated by of
& Za is Such that P(Z 7x)=a. ZnNc0;o). where 2 so e loo (1-a2 t C.I's lower bound i X - o za * Level & JJ كما وN ها we reject Ho at 2) x-u za < z 9 X - Mo < Za o XI 2 a Za < Mo R 7 Mo 7 ł - Za Za 7 a lool(-a) y confidence lower buun di
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