When a survey asked​ "About how many hours per week do you spend sending and answering​ e-mail?", the summary statistics were as shown in the graphing calculator screen shot. Complete parts a through...

When a survey asked​ "About how many hours per week do you spend sending and answering​ e-mail?", the summary statistics were as shown in the graphing calculator screen shot. Complete parts a through c below.

What is the margin of error at the 90% confidence level for the point estimate of the mean number of​ hours?

The margin of error is ( )

​(Round to two decimal places as​ needed.)

Extracted text: TInterval (6.17,7.57) x = 6.87 Sx = 13.83 n=1050.00