Statistics Question

the question I am to answer using the 4 step hypothesis test is: What is the nature of the relationship between studying and GPA in this sample of students?
from the data of 100 participants I’ve been given this is the info I have; GPA – mean = 8.93. SD = 1.89 Studying – mean = 10.35, SD = 8.67
what test statistic do I use for this? A z-test or an T-test and which formula should I use. Below I have inserted the data file I am using.

 

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