A two-way contingency table is analyzed with a .
a. chi-square goodness-of-fit test
b. chi-square test of independence
c. Mann-Whitney U test
d. Wilcoxon signed-ranks test
Question 2
A manufacturer uses a new production method to produce steel rods.
A random sample of 17 steel rods resulted in lengths with a standard deviation of 4.6 cm. At the 0.10 significance level, test the claim that the new production method has lengths with a standard deviation different from 3.5 cm, which was the standard deviation for the old method.
