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

question 34

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.Using $\alpha$ = 0.10,the appropriate decision is _______.

• A)reject the null hypothesis and shut down the process
• B)reject the null hypothesis and do not shut down the process
• C)fail to reject the null hypothesis and shut down the process
• D)fail to reject the null hypothesis and do not shut down the processe)do nothing

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