One-sided alternative hypotheses are rarely used and I usually discourage their use. The point is, why limit yourself to a one-sided alternative hypothesis? If the results should happen to be statistically significant . . .
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Dear Creech,
I’m very much impressed with the last para:
“research hypothesis” is synonymous with “expected findings”, but not synonymous with “alternative hypothesis”. In other words, …, use two-tailed alternative hypotheses but then add a section called “expected findings”.
Regards
Bijaya G. Shrestha