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Before any order is shipped. inspectors at Alvarez Manufacturing test a sample of nished units for breaking strength. 'I'ou select a simple random sample of
Before any order is shipped. inspectors at Alvarez Manufacturing test a sample of nished units for breaking strength. 'I'ou select a simple random sample of units from a recently completed order and nd that the sample average breaking strength is 314 pounds. From the sample selected, you construct a 35% condence interval estimate of the average breaking strength you could expect to nd if all the units in the order were tested. The interval turns out to be 3'1 4 :I: 15 lbs. How would you interpret your result? 0 Approximately 95% of the units in the order will have a breaking strength of between 335.5 lbs. and 321.5 lbs. Q Approximately 95% of the units in the sample have a breaking strength of between 335.5 lbs. and 321.5 lbs. :1 \"2 Approximately 95% of the units in the population will have a breaking strength of between 336.5 and 321.5 lbs. Q We can be 35% condent that all the units in the order have a breaking strength of between 336.5 lbs. and 321.5 lbs. D lfwe were to repeat this estimating procedure a large number of times, approximately 35% of the intervals we construct would contain the actual order average breaking strength
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