This uses stat disk website, which is where the 465,506 birth weights data is listed, I just need help on how to input to get the answer.
this is hypothesis testing.

Use all 465,506 birth weights to test the claim that babies have a mean birth weight less than 3255 grams. Use a 0.05 significance level. You get a certain conclusion. If we decrease the significance level to 0.045, then 0.040, then 0.035, then 0.030, then 0.025, then 0.020, then 0.015, then 0.010, and finally to 0.005, which of these new significant levels is the first (equivalently the greatest) that would give rise to a different conclusion than the conclusion for the original significance level of 0.05?