1. Assume that the data obtained when each student in the class measured the width of a quarter, using a pair of calipers was as follows (all measurements in inches):

.95
.952
.952
.953
.95
.943
.909
.951
.591 (later corrected to .951)
.951
.94
.93
.96
.951

1a. The descrepany between the measurements of .952 and .95 is an example of what type of error?

(A) measurement and roundoff error
(B) sampling error
(C) human and machine error
(D) bias

Answer: (A)

1b. The correct measurement is very close to .951, yet one student recorded .591. This is an example of what type of error?

(A) measurement and roundoff error
(B) sampling error
(C) human and machine error
(D) bias

Answer: (C)