Case Study 345 4. A second shipment of cans is received. Ten randomly sampled cans are tested with the following results. Can 1 2 3 4 5 6 7 8 9 10 Pressure at failure 96 97 99 100 100 100 101 103 103 120 Explain why the second sample of cans is stronger than the first sample. 5. Compute the sample mean ̄x and the sample standard deviation s for the second sample. ̄ x = 101.9, s = 6.7404 6. Using the same method as for the first sample, estimate the proportion of cans that will fail at a pressure of 90 or less. 0.0384 Tech: 0.0387 7. The shipment will be accepted if we estimate that the proportion of cans that fail at a pressure of 90 or less is less than 0.001. Will this shipment be accepted? No 8. Make a boxplot of the pressures for the second sample. Is the method appropriate for the second shipment? No
navidi_monk_elementary_statistics_2e_ch7-9
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