normal distribution

Question 1

sampling distribution

Answer 1

the variation in values for a given estimate (statistic) is described by a sampling distribution and allows probabilities to be assigned to estimates (statistics)

Question 2

central limit theorem

Answer 2

distribution of sample means approximates a normal distribution (also known as a ‘bell curve’) as the sample size becomes larger, assuming that all samples are identical in size, and regardless of the population distribution shape

Question 3

z-transformation

Answer 3

transforming observations so that their mean is zero and their standard deviation is one