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10:23 AM Wed Dec 16 96% exam 3-1372-2020 Home Insert Draw Formulas Data Review View 8 Q E . .. Calibri (Body) 11 B I U abe A ABC 123 fx B C D E G H M N O P Q R S U V W X Z AA II. A II.B. Z-Test T-Test For IIB we must find x bar and s from the sample data a) a) 60 HO mu 10 H1 . mu =/= 105 85 Sample Average, x bar= 80 100.833 b) Right tailed b) Two-tailed 105 8 crit = 1.64485 crit = -3.10581 120 Sample Standard Deviation, S= 9 3.10581 170 35.9819 10 C) C 165 11 2.54558 1* = -0.40114 110 12 95 12 13 d) Reject Ho, d) Do not Reject Ho 85 14 The average wait is not The roomates utility bill has 65 15 10 minutes or less. been around $105. 16 17 18 Common Mistakes: 19 Swapping the Z- or T- Test, thus using the wrong critical values 20 Incorrect null and alternate hypotheses 21 Forgetting to divide alpha by 2 in the two-tailed test 22 23 24 25 26 27 28 29 30 31 Exam3la-c Exam31IA,B Exam3/IC Exam31ID +10:23 AM Wed Dec 16 96% exam 3-1372-2020 Home Insert Draw Formulas Data Review View 8 Q E . .. Calibri (Body) 11 B I U abe A ABC 123 EX fx A B C D E F G H K L M N O P Q R S I. Sampling Distribution a. b. C. IDAWN P(X > 1500 ) P(1350