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I need help asap. Math statistics question.?
It won't let me post, so I'll add a link in an update immediately.
A random variable x has a mound shaped distribution with a standard deviation of sigma=9. A random sample has a size of n=36 has a sample mean of 20. Build a 95% confidence interval for the population mean.
1 Answer
- ?Lv 65 years ago
Assuming 95% confidence,
CI (for u) = (sample mean) ± [(pop' standard deviation)(z critical)] / (√N)
= 20 ± [9(1.96)] / √(36)
= 20 ± 2.94
You get the z - critical value from a table in your textbook. You should be able to find it.
