![]() ![]() Compare the interquartile ranges (that is, the box lengths), to. Learn how to read and interpret box plots, a tool for analysing the distribution and level of scores for a group of WS scale scores. All four sections contain about the same number of data values. the salaries at Welsh Bank and Bank of Finland are equally consistent (since the interquartile range, £18,000, is the same for both. Guidelines for comparing boxplots Compare the respective medians, to compare location. INTERPRETING Box and Whisker Plots - A box and whisker plot separates data into FOUR sectionsThe two parts of the box and two whiskers.Therefore, people earn more on average at the Bank of Finland than at Welsh Bank. the median salary is higher at the Bank of Finland ( £62,000 compared to £52,000).The 75 th value for Welsh Bank corresponds to a salary of £61,000, and the 75 th value for The Bank of Finland corresponds to a salary of £68,000.Īs a result, the completed box plots should be similar to the two below:ī) By comparing the two box plots, we can see that: Thus, the lower end of the box is the 1st quartile. As shown in the video, there are three quartiles that have values larger than ten that means that 3/4 of the quartiles have kids older than 10. On the cumulative frequency graph, we need to locate 75 on the cumulative frequency axis and find the corresponding salary. The box itself indicates the range in which the middle 50 of all values lie. Box Plots Learning Outcomes Display data graphically and interpret graphs: stemplots, histograms, and box plots. Think of the box-and-whisker plot as split into four parts (the first, second, third, and fourth quartiles), making each part equal to 1/4 (essentially 25) of the plot. We have the smallest value ( 220) and the largest value ( 400), so we will have to work out the remaining values. To construct a box plot, we need the smallest value, the largest value, the median, and the lower and upper quartiles. The box plot is suitable for comparing range and distribution for groups of numerical data, illustrated by a box with whiskers, and a center line in the middle. ![]()
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