How to Find the IQR. IQR stands for Interquartile Range, and it is used in statistical analysis to help draw conclusions about a data set. It is often preferred over the range in measuring the spread of a data set, because it excludes most outliers.You can learn how to find the IQR by reading the following:he IQR is defined as the difference between the upper quartile and the lower quartile of a data set, sometimes written as Q3 - Q1. Ad. 2. Organize your numerical data set in ascending order.
The Mesozoic era is centred between two mass extinctions, the Permian-Triassic event and the Cretaceous-Poleogene event. The Permian-Triassic event was the largest mass extinction in our world's history.
An era of geologic time, from the end of the Precambrian to the beginning of the Mesozoic. The word Paleozoic is from Greek and means old life. Permian (286 - 248 million years ago) The final period of the Paleozoic era.It is named after the province of Perm, Russia, where rocks of this age were first studied.ver time, life forms change. Their fossil record allows geologists to date and compare rocks across geological time. For example, dinosaur fossils are only found during the Mesozoic era some 245 to 65 million years ago. The following table shows the geologic time scale.