Exam 1

What is descriptive statistics? It is descriptive. We summarize and describe. It's all about___

What is inferential statistics? It is about inferring and generalizing. We are drawing_

• Conclusions

• Resolutions

• Drawings

• Systems

Reliability is how__test scores are; validity is the__ of the measure, or the test items

• consistent, accuracy

• visible, clear

• coherent, normalized

• systemic, generalized

An English professor wanted to know if there was a connection between how long her students slept and their test scores. What are the independent and dependent variables? Identify each. 

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• Dependent variable is what comes next (effect)

  How long you sleep (independent variable) affects your test score (dependent variable).

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In an experiment, children were exposed to a violent film and a non-violent film and their levels of aggression were studied afterward. What is the Independent Variable and What is the Dependent Variable?

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• The independent variable is exposure to violence and the dependent variable is level of aggression.

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What do you know about correlation and causation?

• correlation does not equal causation

  The correlation coefficient states how strong the correlation between two sets of data.

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Identify the scale measurement: nominal

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• Just names (brands)--- there is not meaning or value behind the names/ brands (list names of coffee shops)

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Indicate the scale of measurement: ordinal

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• Ordering --- there IS meaning or value behind the names/ brands (a list of the top 5 coffee shops in Austin, in rank order)

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Name the scale of measurement: Interval

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• There is an Equal numerical to the value. Think a dot plot where each dot has equal distance.

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Ration: Identify the scale of measurement

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• Ratio: Has an absolute zero (points earned, income)

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