Demographers Test Whether Immigrants or Native-Born Canadians Have Higher Fertility

Demographers test whether immigrants or native-born Canadians have higher fertility rates. They obtain sample statistics from both populations and obtain a Z (obtained) score of 2.02 in the comparison of means. Under what conditions could they reject the null hypothesis, assuming a two-tailed test?

A) only if alpha was set at 0.05: Z (critical) = ±1.96
B) only if alpha was set at 0.01: Z (critical) = ±2.33
C) only if alpha was set at 0.001: Z (critical) = ±2.58
D) The null hypothesis would be rejected at any alpha value.