c. For which sample size would I need to know that population distribution of X, teacher salaries, is normal in order to answer? Hint for part c 15 C OF d. Assuming a sample size of 68, what is the probability that the sampling error is within $1000. (In other words, the sample mean is within $1000 of the true mean.) Hint for d normal Hint for e and f X e. Assuming a sample size of 68, what is the 90th percentile for the AVERAGE teacher's salary? f. Assuming that teacher's salaries are normally distributed, what is the 90th percentile for an INDIVIDUAL teacher's salary?

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