MQM 100 1st Edition Lecture 2 Outline of Last Lecture II. Exam question #1A. Definition of StatisticsIII. Frequency TablesIV. In-Class ParticipationOutline of Current Lecture V. Mean, Median, Mode, and RangeB. DefinitionsVI. Standard DeviationVII. Quartiles and Interquartile RangeVIII.Percentile and Percentile RankIX. In-Class ParticipationCurrent LectureMean for sample data: Mean=average xAverage x= Σx/nMedian:Median= Middle number, when sample data is ordered numerically*If two middle numbers, the average of the two is the median Mode:Mode=The number with the highest frequency*If more than one, list all highest-occurring numbersThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Range:Range= Largest value subtracted by smallest valueStandard deviation:x∑¿¿¿2¿¿¿x2−¿∑¿¿s=√¿EXAMPLE:x x20 00 0-4 161 18 64=5 =81SO: s=√81−55−1s=√764s=√19s=4.36Quartiles and Interquartile Range0 0 -4 1 8Step 1: order-4 0 0 1 8Step 2: Q2 is median-4 0 0 1 8Step 3: Q1 is median of numbers left of Q2-4-20 0 1 8VarianceStandard deviationStep 4: Q3 is median of numbers right of Q2-4 0 0 14.58IQR= Q3-Q1Percentile and Percentile RankPk=kn/100EXAMPLE 3-22 from book60(12)/100=7.228.2In-Class ParticipationP 137-138 #15 & 2215. Mean: 14.1 22. A. Q1= 3Median: 13.5 Q2= 8Mode: 13,22 Q3= 13Range: 21 IQR= 10Variance: 39.27 B. 10Standard Deviation: 6.27 C.
View Full Document