Hi I need help on what is the answer for this question. Answer with explanation is highly recommended. Below is the question and reference and other concerns will be in the comment section. I hope that you can help me and surely I will give you a positive feedback

Perform the step-by-step process of the test for the problem below: A sports trainer wants to know whether the true average time of his athletes who do 100 meter sprint is 98 seconds. He recorded 18 trials of his team and found that the average time is 982 seconds with a standard deviation of 0.4 seconds. Is there a significant evidence to reject the null hypothesis if u= 98 seconds at the 0.05 level of significance