Question

27. Find the median of the following data: 1,4,5,7, 18, 38, 53 C) 42 D) 52 A) 7 B) 53 E) None of the Above 28. What quartile is the 25th percentile ? C) First B) Second D) Fourth E) None of the Above A) Third 29. You score an 81 on a test that had a mean of 76 and a standard deviation of 4. What is your 2-score? A) 2.0 B) 2.25 C) 0.5 D) 1.25 E) None of the Above 30. Find the z critical value for a left-tailed test at a significance level of 0.01 B) 2.33 C) 1.28 A) -2.33 D) -1.28 E) None of the Above 31. Find the z critical value for a right tailed test at a significance level of 0.01 A) -1.645 B) 1.645 C) 2.33 D) -2.33 E) None of the Above

Answer 1

Sol 91= find median of the following dots 18,38, 53 this date is already in 1,4,5,7 increasing order median middle value 7 what is the 25th Percentile 25 th percent ist 942974% ř= 76, c=4, 4, 4= 81 Z score X-M 76-81 ll ault 4 Z- score = = lids 30 left tailed z-critical value ca 0.01 al2 = 0.005 4-0.005 = 0.995 The area in the 2- table = -2,33 for left failed right failed z-criticed value <= 0.01 a2 = 0.005 60.005 0.995 this area in the z-table = 2.33 for right tapled.