AP Stats Unit 3

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What is the sample size in a survey?

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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.

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CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

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What is randomization in experimental design?

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Randomization is the process of randomly assigning subjects to different treatment groups to eliminate bias and ensure that each group is comparable.

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CCSS.HSS.IC.B.3

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What are lurking variables?

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Lurking variables are variables that are not included in the study but can affect the results, potentially leading to incorrect conclusions.

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CCSS.7.SP.B.3

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What is the purpose of controlling variables in an experiment?

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Controlling variables helps to isolate the effect of the independent variable on the dependent variable, ensuring that the results are due to the treatment and not other factors.

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CCSS.HSS.IC.B.3

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What is a treatment group in an experiment?

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A treatment group is a group of subjects that receives the treatment or intervention being tested in an experiment.

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CCSS.HSS.IC.B.3

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What is a control group?

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A control group is a group of subjects that does not receive the treatment and is used as a benchmark to measure the effects of the treatment.

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CCSS.HSS.IC.B.3

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What does it mean if results are statistically significant?

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Statistical significance indicates that the results observed in an experiment are unlikely to have occurred by chance, suggesting a real effect of the treatment.

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CCSS.7.SP.B.3

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What is the difference between qualitative and quantitative data?

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

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What is the importance of sample size in statistical studies?

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A larger sample size generally leads to more reliable results and reduces the margin of error, making the findings more generalizable to the population.

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What is a hypothesis in the context of an experiment?

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A hypothesis is a testable statement or prediction about the relationship between two or more variables.

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CCSS.6.SP.A.3