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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 26 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

11. The student collected information on n = 35 walk-ins and obtained a sample mean of 17.4831 minutes and a sample standard deviation of 3.739 minutes, calculate the 80% C.I. for , the mean time it takes for the student to solve a walk-in problem. Think about the assumptions you made. Hint: R command t.test() is useless. (a) Between 11.1607 and 23.8055. (b) Between 16.6732 and 18.2931. (c) Between 16.4150 and 18.5512. (d) Between 16.4435 and 18.5227. (e) Between 16.6571 and 18.3091. (f) None of the others.