The Weight of a USB Flash Drive Is 30 Grams $\neq$

question 61

Multiple Choice

The weight of a USB flash drive is 30 grams and is normally distributed. Periodically,quality control inspectors at Dallas Flash Drives randomly select a sample of 17 USB flash drives. If the mean weight of the USB flash drives is too heavy or too light the machinery is shut down for adjustment; otherwise,the production process continues.The last sample showed a mean and standard deviation of 31.9 and 1.8 grams,respectively.The null hypothesis is ______.

• A) n \(\neq\) 17
• B) n = 17
• C) \(\mu\)= 30
• D) \(\mu\) \(\neq\) 30
• E) m ≥ 34.9

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