Statistics derived from the latin word 'Status' or italian word 'statista' or german word 'statistik' each of which means a 'political state'. In ancient times, the government used to collect the information regarding the population and 'property or wealth' of the country- the former enabling the government to have an idea of man-power of the … Read more

Normal distibution is a continuous distribution and every distribution follows normal distribution when sample size is large. It has two parameters, one is mean and second one is standard deviation. When mean = 0 and Sd = 1, normal distribution change into standard normal distribution and curve is known as standard normal curve. Z = … Read more