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PSY32 - Lecture 7

# PSY32 - Lecture 7 - Today Admin Paper 1 due in lab this...

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Today *Admin *Paper 1 due in lab this week *Turnitin.com BEFORE lab *Hard copy to TA at BEGINNING of lab *Correlational Design Last Time *Surveys and Sampling *Key points? *Before we get to Correlational Design, let’s discuss measurement… Measurement Considerations *Variable *Any characteristic that can vary across organisms, environments, or experimental situations *things we measure or manipulate *Different types of variables Types of Variables *An important first-step in measurement is determining whether a variable is * categorical versus continuous *Determines how we quantify or measure the variable. Categorical Variables *With categorical , qualitative , or nominal variables people either belong to a group or not *Examples: *country of origin *hair color (black, blond, brown, red, all of the above) *biological sex (male or female) *animal or non-animal *married vs. single *You can use numbers to designate category membership, but the numbers aren’t instrinsically meaningful *Example: Country of Origin

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1 = United States 3 = Canada 2 = Mexico 4 = Other Continuous Variables *With continuous variables, people vary in a graded way with respect to the variable and can theoretically be measured in infinitely small units *Examples: *age *intelligence *shyness *blood pressure *Types of continuous variables *ordinal *interval *ratio Ordinal * Ordinal : Designates an ordering; quasi-ranking *Does not assume that the intervals between numbers are equal *Example: finishing place in a race (first place, second place) Interval *Designates an equal-interval ordering *The distance between, for example, a 1 and a 2 is the same as the distance between a 4 and a 5 *Example: Common IQ tests
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