The Next Questions Are Based on the Following Information

Multiple Choice

The Next Questions Are Based On The Following Information:
The supervisor of a production line believes that the average time to assemble an electronic component is 14 minutes.Assume that assembly time is normally distributed with a standard deviation of 3.4 minutes.The supervisor times the assembly of 14 components,and finds that the average time for completion is 11.6 minutes.
-What is the z-value for a two-sided test of hypothesis for a population mean when the probability of rejecting a true null hypothesis is equal to .05?

A) 1.645
B) 2.330
C) 1.960
D) 2.575