12. A special cable has a breaking strength of 800 pounds. The standard deviation of the population is 12 pounds. A researcher selects a sample of 20 cables and finds that the average breaking strength is 793 pounds and wants to determine if the breaking strength is something different than 800 pounds using a a = .05. Based on all the information you have been provided with about both the sample and population, which sketch below appears to show the correct Critical Region? B A - 3 -2 - 3 - 2 2 C D 786.5 791 795.5 800 804.5 809 813.5 - 3 - 2 13. For a null hypothesis to be rejected, A. The "discrepancy" between our sample average and population average must be beyond what can be explained with sampling error alone. B. Our sample average should be exactly the same as our population average. C. Our sample average must be shown to be insignificantly different than the population average. D. Our sample average must be shown to be significantly different than the population average. E. Both A and D