3. Researchers are interested in estimating the average number of credit hours Freshmen take per semester. A random sample of 50 Freshmen is obtained and the average number of hours taken per semester was 14.3 with standard deviation 0.3. a. Find a 95% confidence interval for the average number of credit hours Freshmen take per semester. b. What assumption must be true in order for the above CI to be valid? How is the assumption verified? (Be specific!)

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