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TRY TO WORK OUT THE FOLLOWING ANSWERS WILL BE GIVEN LATER: Chapter 8 1. What is the relationship of the standard deviation of the sampling distribution of the mean to the standard deviation of the population under study? __sigma / sqrt(n)_________ 2. What is a characteristic of a population called? __parameter_____________ 3. As the sample size (n) increases, what happens to the spread or dispersion of the distribution of the sample means? ______decreases _____ 4. If the sample size equals the population size, what is the sampling error? _0________ 5. The American Auto Association reports the mean price per gallon of regular gasoline is $3.10 with a population standard deviation of $0.20. Assume a random sample of 16 gasoline stations is selected and their mean cost for regular gasoline is computed. What is the standard error of the mean in this experiment? Divide 0.20 / sqrt( 16) = 0.05 6. The American Auto Association reports the mean price per gallon of regular gasoline is $3.10 with a population standard deviation of $0.20. Assume a random sample of 16 gasoline stations is selected and their mean cost for regular gasoline is computed. What is the probability that the sample mean is between $2.98 and $3.12? 0.6472