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I need help figuring out how to find the critical values for the problem on my stats Hw. A step by step walk through wild

I need help figuring out how to find the critical values for the problem on my stats Hw. A step by step walk through wild be appreciated because I seem to have trouble when it comes to these kind of problems. Thank you so much ??

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6) Find the critical values for an 80% confidence interval of the mean. Assume the population standard deviation o is not known and the sample size is 15

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