Question

The time it takes to complete a scan using a specialized radiological imager varies with the skill of the operator. Recently, a new imager was purchased by a clinic, and two operators were trained to perform the scans. The time to complete a particular scan for eight subjects was measured by both operators. The units are time in seconds. A comparison of the mean times for the two operators provides a check on the training they received and allows us to determine if one of the operators is taking consistently longer than the other. Here are the data. Subject Operator 1 2 3 4 5 6 7 8 1 29 28 26 26 36 29 29 27 2 26 32 28 27 34 29 30 27

(a) To to determine if one of the operators is taking consistently more time than the other, an appropriate procedure is Incorrect: Your answer is incorrect.

(b) To estimate the difference in time between the two operators, an appropriate procedure is

(c) To determine whether the time that it takes operator 1 is related to the time it takes operator 2, an appropriate procedure is

Answer 1

a)

matched pair hypothesis test

b)

matched pair confidence interval study

c)

hypothesis test for regression slope