Statistics Question!! Please please please please!!!!!!!!!! solve this problem w

Question

Statistics Question!!

Please please please please!!!!!!!!!! solve this problem with specific explanation and clear handwriting(or typing) please!

If you solve with your handwriting please solve with clear handwriting.....please....Sometimes I can't read you guys handwriting...

Thanks!

20. Suppose that the raw daily oxygen purities de- livered by an air-products supplier have a stan- dard deviation or 1 (percent), and it is plausi ble to think of daily purities as independent ran- dom variables. Approximate the probability that the sample mean X of n 25 delivered purities falls within .03 (percent) of the raw daily purity mean, Al.

Explanation / Answer

Given S.D=.1

sample size=25

standerd error of mean (Xbar)= Sigma/sqrt n

=.1/sqrt25=.02

we have to find probablityP(Xbar-mu<.03)

Z statistic= Xbar-mu/sigma/sqrt n

P(Xbar-mu<.03%of mu)= P{(Xbar-mu/sigma/sqrtn)<(.03%mu/sigma/sqrt n)}n=25

P(Z<.03%mu/.02, as sigma/sqrtn=.02

P(Z<.03/.02)

P(Z<1.5)=1-P(Z1.5)=.08APPROX.

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