Mill-workers after strike Industrial class Wives of mill-workers All mill-workers Mill-workers before strike Difference of means. ?0.439 * ?0.282 ?0.311 ?0.436' ?0.336 Significance. 6.3 f 4.0 3.75 4.44 2.70 * Difference of the means. t Difference of means divided by square root of the sum of the squares of the errors of the two means. Mx ? M., If result 3 or more difference is V tn 2 ^2 taken as definitely significant: if ^between 2 and 3 as probably significant.
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