Question

Imagine you want to compare the mean of sample(Xbar =50,N =100) to a known population mean(mu...

Imagine you want to compare the mean of sample(Xbar =50,N =100) to a known population mean(mu =40,population standard deviation=40)using the z test.What is the value of z-obtained?

1.00

1.96

2.00

2.50

Math   Statistics-And-Probability   
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Answer #1

Solution :

Given ,

mean = =40

standard deviation = = 40

n=100

=50

= 40

= / n = 40/100=4

using z-score formula

z = - /

z=50-40/4

z=2.50

answer=2.50

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