Lesson 4.2 - Sampling Methods and bias

Front

What is the purpose of randomly selecting samples?

Back

To reduce bias.

Front

What sampling method is used when interviewing the first 30 students who enter the school in the morning?

Back

Convenience sampling.

Front

If a company randomly selects 25 DVDs from a total of 1500 to test them, is this sampling method biased or unbiased?

Back

Unbiased.

Front

If the first 100 people at the park on Thursday were asked if dogs should be off leashes, is this sampling method biased or unbiased?

Back

Unbiased.

Front

What sampling method does a teacher use when she selects the first five students who raise their hands to know the average time spent on homework?

Back

Voluntary Response.

Front

Define 'sampling bias'.

Back

Sampling bias occurs when the sample is not representative of the population, leading to skewed results.

Front

What is 'simple random sampling'?

Back

A sampling method where every member of the population has an equal chance of being selected.

Front

Explain 'systematic sampling'.

Back

A sampling method where members are selected at regular intervals from a randomly ordered list.

Front

What is 'convenience sampling'?

Back

A sampling method that involves selecting individuals who are easiest to reach.

Front

What is the difference between biased and unbiased samples?

Back

Biased samples do not accurately represent the population, while unbiased samples do.