I have come up with two different answers for this question and am worried I am using the wrong formula. What would be the work through/answer for this question.

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 deter-mine 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.

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