Final answer:
The amount of data needed for a representative sample depends on factors such as the sample size, data distribution, population size, and sampling method.
Step-by-step explanation:
The amount of data needed to have a representative sample of the population depends on various factors. The size of the sample, n, should be at least 30 or the data should come from a normal distribution. If the original population is far from normal, then more observations are needed. Additionally, the amount of data needed can also depend on the population size and the sampling method used.