A Level Maths

Summary The values of a discrete random variable are obtained by counting, thus making it known as countable Uniform distribution simply means that when all of the random variable occur with equal probability A random variable with probability density function is the expectation and variance of the data we use the following formulas You must … Read more

Summary The Central Limit Theorem (CLT) basically tells us that the sampling distribution of the sample mean is, at least approximately, normally distributed The Central Limit Theorem is exactly what the shape of the distribution of means will be when repeated samples from a given population are drawn As the sample size increases, the sampling … Read more

Summary The formula for binomial distribution is as follows: We write the binomial distribution as X ~ Bin(n, p) E(X) = np variance(X) = npq Standard deviation = Binomial distribution is a discrete probability distribution. It has four major conditions that we need to keep in mind when dealing with binomial distribution. There are fixed … Read more

Statistics is the branch of mathematics used to collect, analyze, interpret, and present data. The purpose of studying statistics is to be able to develop critical and analytic thinking skills. Statistics is further divided into two branches: Descriptive statistics: It deals with describing a set of data graphically Inference statistics: This obtains information about a … Read more

Summary The mean, median and mode are all measures of the center of a set of data. The skewness of the data can be determined by how these quantities are related to one another By studying the shape of the data we can discover the relation between the mean, median and mode Pearson’s first method … Read more

Summary Statisticians collect the data to investigate the characteristics of a population. After taking a sample it is assumed that the result for the sample reflects the whole population. Some important terms that we must be familiar with are: Census, Sampling unit and sampling frame. Random Sampling: his method gives every item of the population … Read more