normal distribution

Introduction to Normal Distribution #2

We learned about the normal distribution in the first article. We will solve the practice problems shown in the first article to familiarize ourselves with this distribution Empirical Rule problem Find out the percentage of the following data from above example with mean 60 and standard deviation 15 and sample size 10,000. What percentage of shells have size below 75mm ?When looking at the empirical rule of normal distribution we… Read More »Introduction to Normal Distribution #2

Quick Introduction to T distribution #1

What is T distribution? The Student’s T distribution which is commonly known as T distribution is used when the sample size of a statistical study is small and the population variance is not known. The T distribution curve looks very similar to a normal distribution at first glance, however the curve may be narrower or fatter depending on the Degrees of freedom of the sample size and the distribution of… Read More »Quick Introduction to T distribution #1

Introduction to Binomial Distribution #1

What is binomial? The term binomial means consisting of TWO terms. In the world of statistics and probability this means an event that can have only TWO results. These events have to be mutually exclusive, that is if one occurs then the other event cannot occur. So,e examples of mutually exclusive events are given below: tossing coin for heads / tails passing or failing a test an old machine that… Read More »Introduction to Binomial Distribution #1

Introduction to Normal Distribution #1

What is a Normal Distribution? The most commonly found distribution is known as the Normal Distribution. It takes the shape of the bell curve. The average value has the highest frequency and the frequency of values larger or smaller values than the average taper off in a descending curve. The Normal Distribution has a peculiar property where the mean = median = mode. The curve is seen to be symmetric… Read More »Introduction to Normal Distribution #1

2 Z Tables and how to use them correctly

The Standard Normal Table is also commonly know as the Z table. It is used in the calculation of probability on the LEFT side of the normal distribution. To use the Table Calculate the Z value using the formula: Understanding the table When looking at a Z table we should first focus on the LEFT COLUMN and TOP ROW. The left column has the Z value up to the first… Read More »2 Z Tables and how to use them correctly