A researcher runs a regression equation and finds the slope to be significant at the plt;.05 level.

A researcher runs a regression equation and finds the slope to be significant at the p<.05 level. He then runs the same regression twice, once with the men in the sample, once with the women in the sample. Although both of these new slopes are exactly the same as the original slope, neither of these new slopes is statistically significant. Explain what likely happened.