A number of years ago, Goku's power level on different days were tabulated. His power level on n = 100 individual days were selected, and his mean power level on those days was x = 7000, and a known standard deviation of s = 500. Use a 0.05 significance level to test the claim that the true mean power level on those days is below 9000. Null Hypothesis, HO Alternative Hypothesis, H1 Test Statistic, t P-value Significance level Conclusio