Question

Item 25 Item 25 A company observed the wait times at check-out were elevated among its 6 new employees. The new employees were given a course on improving speed at the check-out and the wait times were recorded again after the test.

Before 5 3 4 5 8 7

After 3 4 3 3 4 5

Multiple Choice

1.683

2.50

1.633

1.452

Answer 1

= (2 + (-1) + 1 + 2 + 4 + 2)/6 = 1.67

s_d = sqrt(((2 - 1.67)^2 + (-1 - 1.67)^2 + (1 - 1.67)^2 + (2 - 1.67)^2 + (4 - 1.67)^2 + (2 - 1.67)^2)/5) = 1.633

The test statistic t = ( - D)/(s_d/)

                             = (1.67 - 0)/(1.633/)

                            = 2.50