Dr. Frampton is a professor of English, and she keeps track of the number of misspelled words (errors) in various essays. For her Tuesday class of 40 students, the sample mean number of misspelled words (errors) per essay was 6.49 errors. From previous studies, she has identified the population standard deviation as 2.24 errors per essay. Construct a 99% confidence interval for the mean number of misspelled words in the population of student essays.

What is the lower limit of this confidence interval?

Select one:

a.

5.578

b.

4.402

c.

5.102

d.

5.278

e.

6.522

f.

7.582

g.

7.402

h.

7.198

i.

7.718

j.

7.138