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 = 0.10, the critical "t" values are
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