An economist wonders if corporate productivity in some countries
is more volatile than in other countries. One measure of a
company's productivity is annual percentage yield based on total
company assets. A random sample of leading companies in France gave
the following percentage yields based on assets.
4.5 5.9 3.5 3.3 2.2 3.5 2.8 4.4 5.7 3.4 4.1
6.8 2.9 3.2 7.2 6.5 5.0 3.3 2.8 2.5 4.5
Use a calculator to verify that the sample variance is s2 ≈...