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A truck loaded with 8000 electronic circuit boards has just pulled into a firm's receiving dock. The supplier claims that no more than 3% of the boards fall outside the most rigid level of industry performance specifications. In a simple random sample of 300 boards from this shipment, 12 fall outside these specifications.
Construct the 95% confidence interval for the percentage of all boards in this shipment that fall outside the specifications, then comment on whether the supplier's claim would appear to be correct.
(a) Compute the arithmetic mean of the subscribers' incomes. (b) Compute the modal and median incomes.
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Is it clearly labeled?- Does it display percentages or counts?- Does the accompanying article tell the W s of the variables?
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