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Posted: **Wed May 11, 2022 11:00 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 23 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

10. Using the data, calculate the 95% C.I. for o?, the variance of the time it takes for the student to solve a walk-in problem. Think about the assumptions you made. Hint: R commands mean(t) and var() could be useful.

(a) (3.3860, 16.7205] (b) [3.6471, 18.0111] (c) [3.4534, 16.0273] (d) [3.7461, 14.2178] (e) [2.8092, 23.4975] (f) None of the others.