Z | how to read z table
Contents:WhatisaZTable?[1]ZTable(Right)[2]ZTable(Left)[3]Thez-tableisshortforthe“StandardNormalz-table”.TheStandardNormalmodel[4]isusedinhypothesistesting[5],includingtestsonproportionsandonthedifferencebetweentwomeans.Theareaunderthewholeofanormaldistributioncurveis1,or100percent.Thez-tablehelpsbytellinguswhatpercentageisunderthecurveatanyparticularpoint.WhatisaZTable:StandardNormalProbabilityEverysetofdatahasadifferentsetofvalues.Forexample,heightsofpeoplemightrangefromeighteeninchestoeigh...
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What is a Z Table?[1] Z Table (Right)[2] Z Table (Left)[3]The z-table is short for the “Standard Normal z-table”. The Standard Normal model[4] is used in hypothesis testing[5], including tests on proportions and on the difference between two means. The area under the whole of a normal distribution curve is 1, or 100 percent. The z-table helps by telling us what percentage is under the curve at any particular point.
What is a Z Table: Standard Normal ProbabilityEvery set of data has a different set of values. For example, heights of people might range from eighteen inches to eight feet and weights can range from one pound (for a preemie) to five hundred pounds or more. Those wide ranges make it difficult to analyze data, so we “standardize” the normal curve, setting it to have a mean [6]of zero and a standard deviation[7] of one. When the curve is standardized, we can use a Z Table to find percentages under the curve.
Percentages under the curve...