Table 6. Contingency tables of statistical test for correlation.
| (a) | TEL-VR PEV (y) | |||||
| HMR-left PEV(x) | f (x,y) | ON | OFF | f(x)f(y)/N | ON | OFF |
| ON | 281 | 23 | ON | 277.737 | 26.2635 | |
| OFF | 142 | 17 | OFF | 145.26 | 13.7365 | |
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