Can you please walk me through how to solve this problem? I need a step by step to make it make sense. Thank you!

Let's assume that, over the years, a paper and pencil test of anxiety yields a mean score of 35 for all incoming college freshmen.We wish to determine whether the scores of a random sample of 20 new freshmen, with a mean of 30 and a standard deviation of 10, can be viewed as coming from this population.Test at the .05 level of significance.