PSYCH 240: UNIT 3 & 4
26 Cards in this Set
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Scatter plot shows
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the relationship between 2 numerical variables
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the _____ variable is on the x-axis and the _____ variable is on the y-axis
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explanatory; responde
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If there is a relationship the dots will
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form a cluster (typically linear)
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if the dots on a scatter plot go from bottom left to upper right it is a _______ relationship
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positive relationship
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if the dots on a scatter plot goes from upper left to bottom right the relationship is a _________ relationship
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negative relationship
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the ______ the relationship, the more tight the dots will be on a scatter plot
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stronger
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curvilinear scatter plots are
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non-linear
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What is correlation coefficient (r)?
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measures the strength of the relationship
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correlation coefficient (r) range from
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-1 to 1
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correlation coefficient (r) values closer to ____ have stronger association
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1
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Correlation coefficients (r) of -1 or 1 never really exist unless
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variables measure the exact same thing (ex. height in inches and cm)
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correlation coefficients (r) underestimate the relationship if the relationship is _________
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curvilinear
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correlation coefficient (r) is strongly influenced by
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outliers
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correlation does not imply _____
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causation
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the regression line y = a + bx, b is the
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slope
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the regression line is y=a+bx, a is the
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y-axis intercept (where x=0)
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the residual is
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the distance between the regression line and a particular individual
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heteroscedasity is
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when we see greater residuals at one end of the range
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probability distribution with desecrate outcomes can be shown with ___
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a table or bar graph
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what do pdf stand for?
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probability density function
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probability density function shows
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probabilities of ranges of possible outcomes of an event
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P hat is the proportion
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of times an outcome occurs
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p hat n is
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the number of outcomes in n trials
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the law of large numbers states
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as n trails increases, p hat gets closer to the true probability of p
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probability ranges from
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0 to 1
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one important pdf is
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normal distribution
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PSYCH 240: UNIT 3 & 4