I need most help with figuring out which formula to use.

3. A survey of nonprofit organizations showed that online fundraising has increased in the past year. Based on a random sample of 55 nonprofit organizations, the mean one- time gift donation in the past year was 5 75, with a standard deviation of 5 9 a. If you test the null hypothesis at the 0.01 level of significance, is there evidence that the mean one- time gift donation is greater than $ 707 b. Interpret the meaning of the p- value in this