please help

7. What is the margin of error in the interval (2.56, 4.56) ME = B. Listed to the right are the ages of the Presidents of the US a the times of their inaugurations. Construct a 99% confidence interval estimate of the mean age of presidents at the time of their inaugurations X = T = Standard Error = Margin of error = Upper Bound = Lower Bound = Confidence Interval = STATISTICAL INTERPRETATION TERPRETATION REAL WORLD INTERPRE 9. The other data set to the right measured voltage amounts obtained from the author's back-up UPS. According to the manufacturer, the normal output voltage is 120 volts. Use a 5% level of significance to test the claim that the population mean is different than 120 volts. Step 1 Identify variable and parameter with variable and words X= H or p = Step 2 Identify Null Hypothesis, Alternative Hypothesis, (words and algebraically) and Level of Significance HO 56 Ha 56 Step 3 Check for normality Can you be confident in your decision? 8 Step 4 Find sample statistic, test statistic and pvalue, Draw a picture Xor p SE = Zor T P 3 P Value = dec % Step 5 Make a conclusion about null hypothesis 3 Step 6 Interpret you alternative hypothesis Based on the results, should the author complain to the company about their posted rates