The diameter of 3.5 inch diskettes 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 punching process continues. The last sample showed a mean and standard deviation of 3.49 and 0.08 inches, respectively. Using alpha = 0.05, the appropriate decision is _________ .
Select one:
a. reject the null hypothesis and shut down the punch
b. do not reject the null hypothesis and do shut down the punch
c. do nothing
d. reject the null hypothesis and do not shut down the punch
e. do not reject the null hypothesis and shut down the punch
我选择了a，但非常没自信，因为我不知道题目所说的等于3.5英寸是说h0等于他还是h1，不知道该如何是好，请问怎么办啊？[s:15][s:16]
