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Posted: **Wed May 11, 2022 10:58 am**

: A Stat 510 Student Works At The It Help Desk At Hale Library For Several Weeks The Student Recorded How Long It Took T 1 (29.38 KiB) Viewed 20 times

A Stat 510 student works at the IT Help Desk at Hale Library. For several weeks, the student recorded how long it took to solve the walk-in problems she attended. A random sample of n= 14 walk-in problems was selected and times are listed below. 18.60 19.30 18.48 12.88 17.02 14.62 17.36 17.50 22.18 22.17 17.51 18.92 19.52 20.31

8. Using the data, calculate the 90% C.I. for u, the mean time it takes for the student to solve a walk-in problem. Think about the assumptions you made. Hint: R commands mean(1) and sd(x) could be useful. (a) (13.8167, 22.8076] (b) [17.1172, 19.5071] (c) (17.1962, 19.4281] (d) [17.1106, 19.5136] (e) (17.3961, 19.2281) (f) None of the others.