A Consumer Products Company Wants to Increase the Absorption Capacity

Multiple Choice

A consumer products company wants to increase the absorption capacity of a sponge. Based on past data, the average sponge could absorb 3.5 ounces. After the redesign, the absorption amounts of a sample of sponges were (in ounces) : 4.1, 3.7, 3.3, 3.5, 3.8, 3.9, 3.6, 3.8, 4.0, and 3.9. At the 0.01 level of significance, what is the decision rule to test if the new design increased the absorption of the sponge?

A) Reject null hypothesis if computed t is less than 2.580.
B) Reject null hypothesis if computed t is greater than 2.821.
C) Reject null hypothesis if computed z is 1.96 or larger.
D) Reject null hypothesis if computed t is less than 2.764.