Correlation
(part I)
(part I)
Used to graph the pattern of the relationship between two variables
What is a scatter diagram?
The null hypothesis assumes the relationship between variables is described as this value for 'r'.
What is r=0?
For predictions, the Y axis variable is being predicted and is referred to as this type of variable.
What is a criterion variable?
The Chi-Square test is used for this general type of variable.
What is a nominal (or categorical) variable?
In a contingency table, these values are not placed in parentheses.
What are the observed frequencies?
Type of correlation when dots on a scatter diagram follow a systematic pattern that is not a line.
What is a curvilinear correlation?
Raw scores of X and Y variables must be converted to these type of scores before figuring the strength of the correlation (r).
What are Z scores?
The formula that starts with Y 'hat' is referred to as this.
What is the linear prediction rule?
Each cell of a contingency table contains this type of information about observations.
What is a frequency?
This is the reason all Chi-Square values all positive.
What is the 'O-E differences' are squared?
Variables of this type must be used when performing a correlation.
What is an equal-interval numeric variable.
It is calculated as the average of the cross-products of Z scores.
What is the Pearson correlation coefficient (r)?
This feature of a regression line describes the number of units the line goes up (rise) for each unit it goes across (run).
What is the slope?
This formula is used to determine a value for the amount of mismatch between observed and expected frequencies.
What is the Chi-Square statistic (X2)?
The version of Chi-Square test used when two nominal variables are being evaluated.
What is the test for independence?
Type of correlation when high scores on one variable go with the low scores on the other variable; and lows go with highs.
What is a negative correlation?
The comparison distribution used when evaluating the significance of a correlation.
What is a t distribution?
The Y-intercept of the regression line is also know as this.
What is the regression constant (a)?
This version of the Chi-Square test is used when examining a single nominal variable.
What is goodness of fit?
These values in a contingency table must be calculated for each cell.
What are the expected frequencies?
Multiplying a person’s Z score on one variable (X) by the person’s Z score on another variable (Y) yields this.
What is a cross-product of Z scores?
It is common practice to use this type of test when determining the appropriate cutoff value to test the significance of a correlation.
What is a two-tailed test?
When determining the best linear prediction rule this formula component must be calculated first.
What is the regression coefficient (b)?
This is the comparison distribution used when hypothesis testing with Chi-Square tests.
What is a Chi-Square distribution?
The result of squaring the O-E difference in a single cell and dividing it by the expected frequency.
What is a weighted squared difference?