Multiple choice

Sampling bias: * 1 point occurs when the data-collection method incorrectly estimates a characteristic of the population O occurs when the sampling frame does not reflect the characteristics of the population O occurs when particular groups are under-represented in a survey because they don't want to do it O occurs when people give false or misleading answers O none of the above A cluster sample is a sample where: * 1 point O randomly chosen groups are surveyed O there are several levels of random sampling O you go through the population sequentially and select members at regular intervals O the people have been chosen because they are easily accessible O none of the above