There are 400 students at the school, ranging in age from 14 to 18 years old: Platykurtic distribution exampleĪ sociologist is studying the social media use of students at a small high school. Statisticians now understand that kurtosis is a measure of tailedness, not “peakedness.”Ī trick to remember the meaning of “platykurtic” is to think of a platypus with a thin tail. Although many platykurtic distributions have a flattened peak, some platykurtic distributions have a pointy peak. NoteThe “platy” in “platykurtosis” comes from the Greek word platús, which means flat. Platykurtosis is sometimes called negative kurtosis, since the excess kurtosis is negative. In other words, platykurtic distributions have: Platykurtic distributions have less kurtosis than a normal distribution. What is a platykurtic distribution?Ī platykurtic distribution is thin-tailed, meaning that outliers are infrequent. Occasionally, a female baby elephant will be born weighing less than 180 or more than 240 lbs. Mesokurtic distributions have outliers that are neither highly frequent, nor highly infrequent, and this is true of the elephant birth weights. If a sample has a kurtosis of approximately 3, you can assume it’s drawn from a mesokurtic population. NoteAlthough a population’s probability distribution can have a kurtosis of exactly 3, real data is almost always at least slightly platykurtic or leptokurtic. She finds that the kurtosis is 3.09 and the excess kurtosis is 0.09, and she concludes that the distribution is mesokurtic. The zoologist calculates the kurtosis of the sample. She collects birth weight data for 400 female baby elephants:įrom the graph, we can see that the frequency distribution (shown by the gray bars) approximately follows a normal distribution (shown by the green curve). Suppose that a zoologist is interested in the distribution of elephant birth weights, so she contacts zoos and sanctuaries around the world and asks them to share their data. On average, a female baby elephant weighs an impressive 210 lbs at birth. Normal distributions have an excess kurtosis of 0, so any distribution with an excess kurtosis of approximately 0 is mesokurtic.Since normal distributions have a kurtosis of 3, excess kurtosis makes comparing a distribution’s kurtosis to a normal distribution even easier: Often, kurtosis is described in terms of excess kurtosis, which is kurtosis − 3. Normal distributions have a kurtosis of 3, so any distribution with a kurtosis of approximately 3 is mesokurtic.Kurtosis is measured in comparison to normal distributions. I suggest including clipart that represents diverse cultures and authors, promoting inclusivity and representation in the classroom.A mesokurtic distribution is medium-tailed, so outliers are neither highly frequent, nor highly infrequent. "The clipart selection related to literature and language arts is fantastic! It has allowed me to create visually engaging materials for my English classes. Featuring a 'community spotlight' section showcasing projects that promote inclusivity and acceptance could inspire others." It's crucial for my child to see diversity in media. Review by appreciate the positive and inclusive representation in the clipart images. Adding a section with ecology-themed clipart for environmental concepts would be wonderful." The realistic plant and animal illustrations enhance my presentations. Review by teach environmental science, and the nature-themed clipart is perfect for my lessons. The simplicity of the website design ensures accessibility, making it easy for my students with various abilities to engage with the content." The clear and vibrant images have been instrumental in creating visual aids for my special education students. "I am incredibly thankful for this clipart website. I would love to see more STEM-related clipart in the future!" The availability of educational clipart specific to different subjects is fantastic. This clipart website has been a treasure trove of high-quality images. "As a high school teacher, I often create custom presentations and handouts for my students. Over these years, we have gathered a tremendous amount of your feedback, and we are pleased to share it with you. Dear users of the clipart-library website, this year marks the 7th anniversary of our website.
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