![]() Either use software or a standard normal table. The 80th percentile (Figure 2) is the area of a left tail that excludes 20% of the area on the right.įinding the 80th percentile (or for that matter any other percentile) is easy. The middle 80% under a bell curve (Figure 1) is the middle section of the bell curve that exlcudes the 10% of the area on the left and 10% of the area on the right. The following figures show the difference between the middle 80% under a bell curve and the 80th percentile of a bell curve. The question in the email is a teachable moment and deserves a small blog post. The student sent me an email asking for an explanation. The student then tried to answer the practice problem with the 80th percentile, which of course, did not match the answer key. The student was confusing the middle 80% of a bell curve with the 80th percentile. A student sent me an email about a practice problem involving finding the middle 80% of a normal distribution.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |