Question: Please explain answer A high school institutes a new program to help their students prepare for the ACT test. A random sample of 112 students

Please explain answer

A high school institutes a new program to help their students prepare for the ACT test. A random sample of 112 students who used this new program had a mean score of 21.7. If we assume the population standard deviation is 6.1, construct a 90% confidence interval for the mean ACT score for all students who use the new program

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