A special cable manufactured by Mullen Inc. has a breaking strength of 800 pounds ...

 A special cable manufactured by Mullen Inc. has a breaking strength of 800 pounds (normally distributed) A researcher selects a random sample for 20 cables and finds the average breaking strength is 793 pounds with a standard deviation of 12 pounds. Do these data support the claim that the average breaking strength is not 800 pounds? Test at 0.02 level