This activity contains in total 11 questions Each complete a

This activity contains in total 11 questions. Each complete answer will have a value of 0.9 points. 1. The pH of an acid solution used to etch aluminum varies somewhat from batch to batch. In a sample of SO batches the mean pH was 2.6. with a standard deviation of 0.3. Let p represent the mean pH for batches of this solution. a) Find the P-value for testing H0: Mu 2.5.

Solution

1) a)

n =50 , mean = 2.6 , SD = 0.3

z = (X - X(mean)) / ( SD/sqrt(n))

= ( 2.5 - 2.6)/( 0.3 / sqrt(50) )

= -2.35

Therefore P-value = 0.0094 Answer