PSY325: Statistics for the Behavioral & Social Sciences 10 question quiz

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PSY325: Statistics for the Behavioral & Social Sciences 10 question quiz

The n-1 in the denominator of a correlation formula indicates _________. (Points : 1)

  a multiple correlation
  a negative correlation
  a correlation designed for a group of data of any size
  a correlation from sample data

Which of the following defines a linear relationship between variables? (Points : 1)

  As one variable rises and falls, the other does likewise.
  The relationship is positive or negative, but not both.
  The relationship between variables depends upon the range of the data.
  As one variable increases or decreases, the other tends to level o

Under what circumstances would SEest = 0? (Points : 1)

  If sy = 0
  If sy = 1.0
  If rxy= 0
  If rxy = 1.0

Two variables are considered to be independent if the correlation of scores on the variables turns out to be close to___. (Points : 1)

  +1.00
  0.00
  -1.00

Another name for the b value in a regression solution is _________. (Points : 1)

  the intercept
  the regression coefficient
  the error term
  the criterion value

Theoretically, the standard error of the estimate is ___________. (Points : 1)

  the mean of all possible error scores
  the sum of all possible error scores
  the standard deviation of all error scores
  the sum of all error score variances

Each point in a scatter plot represents which of the following? (Points : 1)

  A predicted value
  A measure of either the x or the y variable
  The group to which the measure belongs
  The measure of both variables

The coefficient of determination (rxy2) is defined by __________. (Points : 1)

  the statistical relationship between x and y.
  how linear the relationship between x and y is.
  how much of y can be explained by changes in x.
  the variation in the x/y relationship due to chance.

A negative correlation between the predictor and criterion variables will be reflected in __________. (Points : 1)

  an increased error in the prediction
  a non-linear relationship between x and y
  a regression line that declines left to right
  a solution that predicts unusually low values of y

Since a correlation of +1 is considered “perfect,” a correlation of -1 is as “imperfect” as can be. (Points : 1)

  True
  False