Lecture - Methods Flashcards
statistics
give an idea about how wrong we are likely to be although their precision can produce a false sense of certainty.
concept
a mental construct that represents some part of society through in simplified form
variable
concept whose value changes form case to.case
measurement
determining the value of a variable in a specific case
operationalizing a verbal
specifying exactly what is measured in assigning a value to a variable
ex. looking at someones education and income to figure out their class
reliability
consistent measurement
- repeated measurement of the same case gives the same answer
validity
measuring precisely what is intended
-did you measure what you wanted to?
Mean
average found by adding a series of number and dividing by the number of cases
- measurement of central tendencies
Median
value that is in the middle of the number line
Mode
value of the variable that occurs more frequently than any other
standard deviation
measure of dispersion
- estimates how far away are the observations from the mean
1. subtract mean from each observation and then square result
2. ass up deviations
3. divide sum by # of observations
4. take the square root of result
independent variable
variable that causes change in another variable
dependent variable
a variable that changes due to the influence of another variable
-“hang from”
Hypothesis
If (insert change in independant variable) THEN (insert change in dependent variable)
Correlation
2 variables related in some way, not necessarily through cause and effect