Writing a research paper about conducting my own experiment. My study is: matern

Question

Writing a research paper about conducting my own experiment. My study is: maternal age and the effect on fetal development. The prompt asks to answer the following "The hypothesis test needs to be formally stated (null and alternative clearly and correctly given with variable names and inequalities/equalities in the correct spot). Describe whether this is a one-tailed or two-tailed test, your chosen significance level (with justification), and what the p-value would tell you in the context of your problem." My question is would the the test need to be one-tailed or two tailed for this type of study?

Explanation / Answer

as the research hypothesis here is that maternal age has some effect on  fetal development.

as the effect can be averse or non averse therefore this is biderectional hypothesis

therefore it should be two tailed.

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