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A teacher claims that the boys in her classes are taller than the average 69 inches for boys in this age group. The sample of

  1. A teacher claims that the boys in her classes are taller than the average 69 inches for boys in this age group. The sample of 30 boys had an average height of 70.4 in. If the standard deviation for the height of all boys in this age group is 2.75 inches, is there enough evidence to support the teacher's claim at 0.10?

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