Given the sample mean of GPA, the sample SD, and the SE below:

Question

SM: 3.2454
SD: 0.4635
SE: 0.0309

construct a 99.7% confidence interval for the population mean gpa.

My answer: 3.2145 to 9.6435

Answer 1

99.7% = mean ± 2.965 SEm

Answer 2

I am confused --- so the correct answer is 2.965 or do I have to +, - from 3.2454 to get a range?

Answer 3

this answer is wrong