AP Stats Unit 3

Front

What is the sample size in a survey?

Back

The sample size is the number of individuals or observations included in the survey. In the Consumer Expenditure Survey, the sample size is the 200,000 households that returned their results.

Front

What is a simple random sample?

Back

A simple random sample is a sampling method where every individual has an equal chance of being selected. If not all groups have the same chance, it is not a simple random sample.

Front

What is response bias in surveys?

Back

Response bias occurs when participants provide inaccurate responses, often due to the way questions are asked or the context in which they are asked.

Front

What is the purpose of stratified sampling?

Back

Stratified sampling is used to ensure that specific subgroups (strata) within a population are adequately represented in the sample.

Front

What does it mean if a result is statistically significant?

Back

A statistically significant result indicates that the observed effect is unlikely to have occurred by chance, suggesting a real difference or relationship.

Front

What is the difference between qualitative and quantitative data?

Back

Qualitative data describes characteristics or qualities (e.g., colors, names), while quantitative data involves numerical values that can be measured (e.g., height, weight).

Front

What is a population in statistics?

Back

A population is the entire group of individuals or instances about whom we hope to learn, while a sample is a subset of that population.

Front

What is the role of randomization in experiments?

Back

Randomization helps eliminate bias by ensuring that each participant has an equal chance of being assigned to any treatment group.

Front

What is a hypothesis in statistical testing?

Back

A hypothesis is a statement that can be tested statistically, often formulated as a null hypothesis (no effect) and an alternative hypothesis (some effect).

Front

What is the significance of a control group in an experiment?

Back

A control group serves as a baseline to compare against the experimental group, helping to isolate the effect of the treatment.