The Professor's Response

Hi Professor,
I got a similar answer for #20 on HW 7.2 but it wasn't as exact.
Can you help me find out what I did wrong?

My final answer is: [821,420.1 , 4,224,149.9]

My margin of error concluded to be: 1,701,364.938
My z alpha/2 is: 2.33

  See the professor's answer below.

Professor McGukian

Hi Christina,

Your answer is a little off because of the critical z value that you used. It seems you did not use the t-table to find the critical value. I actually created a video for this problem to answer another student's question.  Click the 'Ask the Professor' link and find the question category for 'Confidence Interval for Mean'.

Watch the video for more detail,

Professor McGuckian

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