Mathematics Anxiety and Mathematics Self-efficacy in Relation to Medication Calculation Performance in Nurses Page: 88
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Scatter plots of the residuals (see Figure 7), "the differences between the scores predicted
by the multiple regression equation and the actual scores" (Foster et al., 2006, p. 38), were
examined comparing each independent variable with the dependent variable to determine,
normal distribution, linearity, and homoscedasticity. "If all three assumptions are met, the plot of
the residuals against predicted scores will be roughly rectangular" (Foster et al., 2006, p. 38).
Since scatter plot of residuals were basically rectangle-shaped, the assumptions were met for
using data in the multiple regression equation.
The data were examined for outliers in data using frequency distributions. The outliers
outside three standard deviations were examined compared to the normal curve. The family size
of 15 was outside the normal curve, since this was not one of the variables studied the person
was not deleted (See Figure 8).
Number of People Living in Home
30- Mean = 3.2
Std. Dev.= 2.017
N = 84
0 5 10 15 20
Figure 8. Histogram of persons living in home and normal curve overlay identifying outlier.
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Melius, Joyce. Mathematics Anxiety and Mathematics Self-efficacy in Relation to Medication Calculation Performance in Nurses, dissertation, May 2012; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc115119/m1/96/: accessed July 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .