Homework Answers
1) H0 : population mean is 18
Ha: Population mean is less than 18 .
Test statistic, z= 2.7
P- Value = P( z < -2.7) = 1- P(z < 2.7) = 1 - 0.99653 = 0.00347
2) H0 : population mean is 18
Ha: Population mean is lnot equal to 18 .
Test statistic, z= 2.7
P- Value = 2*P( z < -2.7)
= 2 [ 1- P(z < 2.7) ]
= 2 [ 1- 0.99653]
= 2 * 0.00347
= 0.00694
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