The Diameter of 3 $\neq$ 16
B)n = 16
C) $\mu$ = 35
D)

The diameter of 3.5 centimetre discs is normally distributed.Periodically, quality control inspectors at Winnipeg Discs randomly select a sample of 16 discs.If the mean diameter of the discs is too large or too small the disc punch is shut down for adjustment; otherwise, the punching process continues.The null hypothesis is ___.

A) n $\neq$ 16
B) n = 16
C) $\mu$ = 3.5
D) $\mu$$\neq$ 3.5
E) $\mu$ ≥ 3.5