4.30. According to Current Population Reports, the population distribution of number of years of edu- cation for

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4.30. According to Current Population Reports, the population distribution of number of years of edu- cation for self-employed individuals in the United States has a mean of 13.6 and a standard deviation of 3.0. Find the mean and standard error of the sampling distribution of y for a random sample of

(a) 9 residents,

(b) 36 residents,

(c) 100 residents. Describe the pattern as n increases.

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