statistics quiz just 11 questions easy

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1. A group of 65 randomly selected students have a mean score of 31.8 with a standard deviation of 5.4 on a placement test what is the 90% confidence interval for the mean score of all students taking the test?

2. A credit union took a random sample of 40 accounts and Ideal the following 90% confidence interval for the main checking account balance at the institution

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