P-values for the significant net difference test
In significant net difference tests, the P-values are printed in the ntd column in place of the value returned by the T statistic. Here is the same table as in
Example of a significant net difference test, but with P-values instead of the value of the T statistic shown in the ABCD column.
London Manchester ------------ -------------- Does Does Not Not TOTAL Works Work Works Work ABCD (A) (B) (C) (D)
TOTAL 1800 572 440 382 384 Past 7 days 23 35 20 23 11 0.432 1-2 weeks 15 19 15 12 11 0.208 2-4 weeks 13 15 10 17 11 0.894 1-3 months 12 8 15 23 6 0.000 3-6 months 6 8 5 6 6 0.241 Over 6 months 6 4 5 6 11 0.059 Never tried non- 24 12 30 14 43 0.008 alcoholic wine ----------------------------------------------- NTD: Columns Tested (5% risk level) - A/B/C/D |
The P-value is the probability that the difference is significant. In this table, any value less than or equal to 0.05 indicates a difference that is significant at the 95% confidence level or higher.
The P-values in this example show highly significant differences in the 1-3 months and Never tried rows. The differences between columns A and B are significantly different from the differences between columns C and D. No other rows have significant differences at the 95% confidence level.
See also