A random sample of 21 Wake Tech students that attend class on campus were asked, "How much did you spend on lunches this week?" The mean response was $21.85 with a standard deviation of $10.53. Assuming the population is normally distributed, construct a 90% confidence interval for the mean amount Wake Tech students spent on lunch last week.

Do not round the values below.

= Blank 1

s = Blank 2

n = Blank 3

df = Blank 4

Round the values below to three decimal places.

= Blank 5

E = Blank 6

Round the values below to two decimal places.

Lower endpoint = Blank 7

Upper endpoint = Blank 8

We are 90% confident that the mean amount Wake Tech students spent on lunch last week is between Blank 9 and Blank 10.