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A simple random sample of students is selected, and the students are asked how much time they spent preparing for a test. The times (in hours) are as follows :

1.3 7.2 4.2 12.5 6.6 2.5 5.5

Based on these results, a confidence interval for the population mean is found to be u = 5.7 PLUS OR MINUS 4.4. Find the degree of confidence.

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