A Manufacturer Wants to Increase the Absorption Capacity of a Sponge

A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the
Average sponge could absorb 103.5ml. After the redesign, the absorption amounts of a sample of
Sponges were (in millilitres) : 121.3, 109.2, 97.6, 103.5, 112.4, 115.3, 106.5, 112.4, 118.3, and 115.3. What is
The decision rule at the 0.01 level of significance to test if the new design increased the absorption
Amount of the sponge?

A) Do not reject null hypothesis if computed t is less than 2.580
B) Do not reject null hypothesis if computed t is less 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