1. A consumer advocacy group, investigating the prices of steel-belted radial tires pro duced by three major manufacturers, collects the following data.
|
Year
|
Company A
|
Company B
|
Company C
|
|
1995
|
$62.00
|
$68.00
|
$65.00
|
|
2000
|
$70.00
|
$72.00
|
$69.00
|
|
2005
|
$78.00
|
$75.00
|
$75.00
|
2. A small fourth-grade class is randomly split into two groups. Each group is taught fractions using a different method Af ter three weeks., both groups are given the same 100-poinl test. The scores of students in the first group are 82, 86, 91, n.and 68; the scores reported for the second group are 76, 63, 80, 72, and 67.