The Web site of a photo processor allows customers to send digital files of pictures to be printed on highquality paper with durable inks. When the inks used by the processor start to run out, the color mix in the pictures gradually degrades.
(a) How could the facility use a quality control process to identify when it needed to switch ink cartridges? Will it be necessary to check every photo or only a sample of photos?
(b) If the facility samples photos, would it do better to group the photos into a large batch and then calculate a mean and standard deviation (for the measured color mix) or only wait a little while before calculating the mean and SD?
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