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Figure 9. Data point cloud, regression line and 95%-confidence interval (CI) according to sub-studies as published by Griefahn et al. (1976) (SPSS 10.0). The studies of Steinicke (1957) and Gädeke (1969) are disregarded.

Figure 9. Data point cloud, regression line and 95%-confidence interval (CI) according to sub-studies
as published by Griefahn et al. (1976) (SPSS 10.0). The studies of Steinicke (1957) and Gädeke (1969)
are disregarded.