so there ( is or is not ) sufficient

This Question: 3 pts 28 of 28 (20 complete) This Test: 110 pts possible Twelve different video games showing violence were observed. The d iration times of violence were recorded, with the times (seconds) listed below Assume that these sample data are used with a 0.05 significance level in a test of the claim that the population mean is greater than 75 sec. If we want to construct a confidence interval to be used for testing that claim, what confidence level should be used for a confidence interval? If the confidence interval is found to be 0.4 sec