When working on statistics problems, you probably will have occasion to compare two box plots. As this blogger says, “a box plot is a simple yet powerful tool, with a truly great design - a universally beautiful thing that stands the test of time”. Free. A Box plot can also be drawn from a Cumulative Frequency diagram. Shape of data distributions. (2 Marks) The box plot below shows the amount spent by people over the Christmas period in 2015. b. median, and one about spread, ie. Square interquartile. From working out the cumulative frequency to constructing a box plot to then comparing two data sets, its all covered in these videos. Comparing Box and Whisker Plots - Multiple choice questions. Box plots are particularly good for comparing different distributions at a glance. Outliers: The median can also be indicated by dividing the box into two. (c) Hunter thinks that the total amount of time spend by all of the customers visiting the indoor restaurant is greater than the total amount of time spend by all of the customers visiting the open-air restaurant. Info. Loading... Save for later. The image above is a comparison of a boxplot of a nearly normal distribution and the probability density function (pdf) for a normal distribution. Sameena used her results to work out the information in this table. Comparing Box and Whisker Plots - Multiple choice questions. Short boxes mean their data points consistently hover around the center values. stratified sampling. Videos, worksheets, 5-a-day and much more The lowest and highest value make the ‘whiskers’. worksheet - box and whisker film. PLAY. A box plot shows a visual representation of the median and quartiles of a set of data. drawing histograms. The numbers are already in order so the minimum and maximum numbers can be easily read off as 9 and 21, and the middle number can be read as 14. A box plot is a concise way of displaying information about the median, range and quartiles of a data set. Box Plots. The reason why I am showing you this image is that looking at a statistical distribution is more commonplace than looking at a box plot. 4) Compare distributions by comparing 2 box plots. Comparing box and whisker diagrams in a meaningful, relevant way is something that higher GCSE students find notoriously difficult. Emphasise that GCSE exams always seem touse a number of items 1 less than a multiple of 4. The diagram shows the quartiles of the data, using these as an indication of the spread. They show more information about the data than … 5-a-day GCSE 9-1; 5-a-day Primary; 5-a-day Further Maths; 5-a-day GCSE A*-G; 5-a-day Core 1; More. This page has two main sections: Section 1: Two videos which we have created talking through box and whisker plots. This means that most of the links on this page are not yet active. For example, the box plots below show the distribution of the ages of tenants in four different housing areas. It looks at what they are, how to draw them and how to interpret them. (2 marks) For 1 mark, one of: In . The following box plot represents data on the GPA of 500 students at a high school. Comparing data sets. The box plot tells you some important pieces of information: The lowest value, highest value, median and quartiles. median, and … Box_and_whisker_plots LESSON. Drawing a box plot from a cumulative frequency graph. One morning, samples of 50 customers were taken at supermarkets A, B, C and D. The box plots represent the results. 2) Give you important pieces of information to draw a box plot. Age Range: 11-16 Format: web/ppt/xls. Use this information and the cumulative frequency to draw a box plot on the grid below. Home Economics: Food and Nutrition (CCEA). This resource is designed for UK teachers. The girl’s median is 1 more than this which suggests the girls’ have done better on average Write. The lower quartile will be the 3rd number and the upper quartile is the 9th number. Wider ranges (whisker length, box size) indicate more variable data. Make sure you are happy with the following topics before continuing. Usually it will be drawn with an accompanying axis or number line for context. 3. Credit: Illustration by Ryan Sneed Sample questions What is […] Created: Jan 22, 2014| Updated: Feb 24, 2019. That’s something to look for when comparing box plots, especially when the medians are similar. graph is straightforward as long as the median and quartiles have been found. GCSE (1 – 9) Box Plots Name: _____ Instructions • Use black ink or ball-point pen. 2. 15) In a survey, queuing times at supermarket checkouts were recorded. Box Plots allow us to visually represent the distribution of the data. While the portion covering lower quartile, median and upper quartile appears as a box, minimum and maximum data points show up as whiskers at the two ends (see figure below). Cumulative frequency diagrams Hegarty Maths goes over how to construct cumulative frequency diagrams and looks at typical GCSE questions and how to answer them. Answer: Impossible to tell without further information. Drawing a box plot from a cumulative frequency graph is straightforward as long as the median and quartiles have been found. In other words, it might help you understand a boxplot. Your school box plot is much higher or lower than the national reference group box plot. Cumulative Frequency, Box Plots and Comparing Distributions Revision Videos. 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