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1. Classify as independent or dependent samples: White blood cell counts for a group of volunteers before being innoculated, and white blood cell counts for a second group of volunteers after being innoculated.

2. Classify as independent or dependent samples: White blood cell counts for a group of volunteers before being innoculated, and white blood cell counts for a second group of volunteers after being innoculated.

3. An aerospace parts factory has two separate production lines making fasteners; each production line can be regarded as creating a separate population of fasteners, whose widths are normally distributed. A sample of 20 fasteners is selected from each production line for quality control inspection. The width of each selected fastener is measured; and the standard deviations s1 and s2 in the measured widths of the selected fasteners from each production line are calculated. If the design standard deviation in fastener width for each production line population is unknown, can the sample values s1 and s2 be used instead?
yes or no?

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