The diameter of a 3.5 inch diskette is normally distributed. Periodically, quality control inspectors at dallas diskettes randomly select a sample of 16 diskettes. If the mean diameter of the diskettes is too large or too small the diskette punch is shut down for adjustment; otherwise, the puching process continues. The last sample showed a mean and standard deviation of 3.49 and 0.08 inches respectively. Using a=0.05, the critical "t" values are
a) -2.120 and 2.120
b) -2.131-and 2.131
c) -1.753 and 1.753
d) -1.746 and 1.746
e) -2.567 and 2.567