A random sample of 40 students ate at a fast-food restaurant an average of 4.3 times a week with a standard deviation of 2.1.

Question

A random sample of 40 students ate at a fast-food restaurant an average of 4.3 times a week with a standard deviation of 2.1. Using the table below, find the 90% confidence interval.
 3.75 to 4.85
 3.65 to 4.95
 3.44 to 5.16
 3.80 to 4.80

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