2. Confidence interval σ known  a=1    Dr. Patton is a professor of English. Recently she counted the number of misspelled words in a group of student essays. She noted the distribution of misspelled words per essay followed a normal distribution with the population standard deviation of 2.4a words per essay. For her Tuesday class of 40 students, the mean number of misspelled words per essay was 6.05. Construct a 95% confidence interval for the mean number of misspelled words in the population of students’ essays.

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