Psychology Statistics

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Psychology

42 Terms

1
statistics
characterizes a sample
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2
parameter
characterizes a population
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3
sample
subset of observations from the population of interest
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4
population
ALL participants
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5
descriptive statistics
help us organize and summarize data
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6
inferential statistics
draw conclusions about populations based on sample data
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7
independent variable
used to describe/explain DV differences or cause the DV changes
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8
dependent variable
outcome of interest in an experiment, what we measure
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9
extraneous variables
variables (not the IV) that impact the DV, interfere with our findings
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10
quantitative
tells about amount or degree of variable
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11
qualitative
tells if things are different or the same but not amount
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12
nominal
categorize people/subjects into groups, groups usually have a title
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13
ordinal
NOT equal intervals
(ex. educational level, place in a contest, standing in graduation class)
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14
interval
equal intervals, categorize, rank order
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15
bar graph
set of NONadjoining rectangles whose heights represent frequency values, NOMINAL data
set of NONadjoining rectangles whose heights represent frequency values, NOMINAL data
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16
histogram
Set of ADJOINING rectangles whose heights represent the frequency of their values; QUANTITATIVE data
Set of ADJOINING rectangles whose heights represent the frequency of their values; QUANTITATIVE data
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17
frequency polygon
Series of dots whose heights represent the frequency of values connected by a line; QUANTITATIVE data
Series of dots whose heights represent the frequency of values connected by a line; QUANTITATIVE data
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18
positive skew
mean>median
mean>median
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19
negative skew
mean
mean<median
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20
central tendency
single score representing the entire data set and it helps us interpret single scores (ex. mean, mode, range)
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21
variability
a way of summarizing how spread out the scores in a distribution are
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22
mode
most commonly occurring score
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23
median
value that divides a distribution into two equal halves
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24
mean
arithmetic average
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25
μ
mean for a population
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26
mean for a sample
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27
correlation
quantify the strength and direction of the relationship between two variables
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28
spurious
artificially high or low
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29
empirical
based on actual scores
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30
generalizability
can apply findings from one sample or context to others
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31
random sample
subset of a population chosen so that all samples of size N have an equal opportunity of being selected
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32
correlational studies
participants come with their group membership (ex. # of pets, political affiliation, gender)
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33
Sampling distribution
distribution of sample statistics
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34
Frequency distribution
distribution of individual scores
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35
conceptual hypothesis
general statement about the relationship between the IV and DV or about the magnitude of a relationship
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36
statistical hypothesis
hypothesis written in mathematical notation
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37
null hypothesis
assumes there is no relationship/difference/effect
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38
1 tailed test vs 2 tailed test
knowt flashcard image
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39
type I error
rejecting a true null
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40
type II error
retaining a false null
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41
matched pairs
the experimenter made the matches (ex. basketball dunking)
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42
repeated measures
same participants are tested twice
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