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)$\mu$ ≥ 34.9

Question

Quizplus · Accepted Answer

The null hypothesis in statistical tests usually states that there is no effect or no difference. In this context, it would assert that the mean weight of the USB flash drives is equal to the expected mean weight, which is 30 grams. Therefore, the correct formulation of the null hypothesis is that the mean weight (μ) of the USB flash drives is equal to 30 grams.

The Weight of a USB Flash Drive Is 30 Grams ≠\neq=

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