Contents: Statistical Comparison of Soil Chemistry Values between Checkdam and Control Samples
Description: Quantitative data on soils were evaluated using a series of F tests to determine if statistically significant differences exist betweeen checkdam soils and control samples. The F test is a statistical test to measure differences in variance between two populations. This test assumes that errors are normally distributed about a mean of zero and that there is homogeneous population variance. Statistical differences were tested at the .01 and .05 levels of significance. Separate tests were conducted by soil horizon, as well as by the soil as a whole. For statistical purposes, the few transitional BA horizons that were sampled were included with the dominant horizon, namely, the B horizon. See check for raw data.
Primary Key: none
Parent Table: none
Columns:
| Name | Type | Size | Contents |
| chemical_variable | VARCHAR | 255 | Chemical Variable |
| horizon | VARCHAR | 255 | Horizon |
| cult_mean | Number | Single | Mean |
| cult_st_dev | Number | Single | Standard Deviation |
| cult_variance | Number | Single | Variance |
| control_mean | Number | Single | Control Mean |
| control_st_dev | Number | Single | Control Standard Deviation |
| control_variance | Number | Single | Control Variance |
| F | VARCHAR | 255 | F |
| df | VARCHAR | 255 | Degrees of Freedom |