Question: 1 . Condence intervals can be calculated only when the population variance is known? B a. Sometimes. E b. Not true. E c. True. [3

1 . Condence intervals can be calculated only when the population variance is known? B a. Sometimes. E b. Not true. E c. True. [3 d. Only when the sample mean is 0. 2. The height of fully grown maple trees is distributed normally with mean 87.5 feet and standard deviation 6.25 feet. A random sample of 12 trees is measured and the average height is calculated. What is the mean of the sampling distribution of the average height? 5 a. 7.9 feet [3 b.76.2feet E c. 87.5 feet E d.25.2feet 3. The height of fully grown maple trees is distributed normally with mean 87.5 feet and standard deviation 6.25 feet. A random sample of 12 trees is measured and the average height is calculated. What is the standard error of the sampling distribution of the average height? 53 a. 0.52 feet ' E b. 6.25 feet 5 c. 1.80 feet 5 d. 25.26feet

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