Need help with this question really stuck on it

1. A recommendation for the amount of vitamin C that a person should have per day is 75 mg. A researcher believes that the mean dosage per day among vegetarians is greater than 75 and decides to test this claim by randomly sampling 120 vegetarians and computing the mean for the sample. a. State hypotheses to be tested (there should be two). b. Is this test right-tailed, left-tailed, or two tailed? c. What sort of results would you like to see to convince you that the researchers claim is likely to be correct? d. In this context, what does statistically significant mean