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Question: Assuming that a simple random sample of size 250 is being selected from a population that is approximately normally distributed (N=100,000). Assuming that the population SD (standard deviation) is equal to 5 and the sample average is equal to 30, determine a 90% confidence interval for the true average of this population. (If this confidence interval can not be determined, explain why not.)
I am supposed to identify which of the three confidence interval types this is (population average, population proportion, or population percentage), and then solve the problem. However, I have no clue how to determine which confidence interval this problem is. Any help would be appreciated. Thanks!!
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