21:17 & 2 012 $ 5G .Ill 47% 5 . . . Z AA AB AC AD AE AF AG AH INTS Out OF POINTS | Out OF 7. What is the margin of error in the interval (2.56, 4.56) ME = Age of President at inauguration UPS(volts) 8. Listed to the right are the ages of the Presidents of the US a the times of 42 123. 10 their inaugurations. Construct a 99% confidence interval estimate of the 43 123.1 11 mean age of presidents at the time of their inaugurations. 46 123.6 12 INTS |Out OF X = T= POINTS | Out OF 46 123.6 13 Standard Error = Margin of error = 47 123.6 Upper Bound = Lower Bound = 48 123.7 15 Confidence Interval = [ 49 123.7 16 STATISTICAL INTERPRETATION 49 123.6 17 INTS |Out OF POINTS | Out OF 50 123.6 51 123.8 19 REAL WORLD INTERPRETATION 51 123.7 20 INTS |Out OF POINTS Out OF 51 123.8 21 51 123.5 22 51 123.7 23 52 123 24 52 123. 25 9. The other data set to the right measured voltage amounts obtained from 54 123.1 26 the author's back-up UPS. According to the manufacturer, the normal output 54 123.7 27 voltage is 120 volts. Use a 5% level of significance to test the claim that the 54 123.7 28 population mean is different than 120 volts. 54 123.8 54 123.8 Step 1 55 123.7 31 Identify variable and parameter with variable and words 55 123.8 EX 55 123.7 33 u or p = 55 123.8 Step 2 56 123.8 Identify Null Hypothesis, Alternative Hypothesis, (words and 56 123.8 36 algebraically) and Level of Significance 56 123.9 HO 56 57 123.8 Ha 56 57 123.9 39 57 123.9 Step 3 57 123.9 Check for normality 58 123.9 60 123.6 61 123.2 INTS Out OF Can you be confident in your decision? POINTS Out OF 61 123. 8 8 61 123 Step 4 62 22.9 Find sample statistic, test statistic and pvalue, Draw a picture. 64 123 Xor p SE = 64 INTS | Out OF Z or T POINTS | Out OF 65 50 68 51 69 52 54 -3 -2 -1 0 1 2 3 62 63 INTS Out OF POINTS | Out OF 64 4 4 65 P Value = 66 dec % 67 68 Step 5 69 Make a conclusion about null hypothesis 70 INTS Out OF POINTS Out OF 72 Step 6 73 Interpret you alternative hypothesis 74 INTS | Out OF POINTS | Out OF 76 77 INTS Out OF POINTS | Out OF Based on the results, should the author complain to the company 78 about their posted rates? 79 80 81 82 83 84 85 O <