Chp 18 Sampling (H2)

Why do we study a sample instead of a population?

• A sample has a more accurate mean and variance

• It may not be possible to investigate the population

• The units in a sample are independent of each other

• The probability of success in a sample is constant

A random sample is one where every member ...

(You may choose more than one answer)

• has an equal chance of being selected

• has the same mean and variance

• has 2 mutually exclusive outcome

• is independently selected

• is part of a normal distribution

• N(1,1)

• N(1,10)

• N(10,1)

• N(10,10)

When do we apply Central Limit Theorem?

(You may choose more than 1 answer)

• Nothing can be done

• Nothing can be done