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Statistical Analysis and Probability: Data Visualization, Descriptive Statistics, and Probability Calculations

This document provides solutions on statistical analysis, probability calculations, and data visualization.

Amelia Ward
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Statistical Analysis and Probability: Data Visualization, DescriptiveStatistics, and Probability Calculations1.A survey of the number of calls received by a sample of Southern Phone Companysubscribers last week revealed the following information.52, 43, 30, 38, 30, 42, 12, 46, 39, 37, 34, 46, 32, 18, 41, 5a)Develop a stem-and-leaf chart.Note: Atypical row for the Stem & Leaf plot might looklike 30269. Where, the vertical line is obtained by using “Shift & |\” key. The line isinserted at the location of the cursor.b)What basic conclusions can be drawn from this chart?c)Compute the 5 number System for this data set and list Xmin, Q1, Q2, Q3 & Xmax.SeeVideos“5_Number_Sysytem”in Videos–Topics In Stat 230.a)The required stem-and-leaf chart is given below;StemLeaf0|51|282|3|00247894|123665|2b)From this chart we cansay that the group 30-39 contains most of the values so mean,median is expected to fall in that group. The data shows a little left skewness. It isbimodal. Minimum value is 5 and maximum is 52.c)Xmin(1stvalue in above chart) = 5, Q1(4thvalue) = 30, Q2 = middle most value = valuebetween 37 and 38 = 37.5; Q3(12thvalue) = 42 and Xmax=last value = 52.2. The chart below gives the percentage of counties in the US that use various methods forrecording votes in 1980 & 2002.Set up side-by-side bar charts by year using the instructionfor Side-By-Side Charts in the Class Notes Conference.Copy/Paste your Chart into theTFE Editor from EXCEL.METHOD19802002Punch cards18.515.5Lever machines36.710.6Paper ballots40.710.5Optical scan0.843.0Electronic0.216.3Mixed3.14.1The required chart is given below.

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Statistics

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