During the last decade, the average score of the quantitative portion of the Graduate Record Examination (GRE) General Test is known to be 588

During the last decade, the average score of the quantitative portion of the Graduate Record Examination (GRE) General Test is known to be 588. In order to compare the GRE scores of DePai; MBA students with this national average, the scores of 30 DePaul MBA students were randomly selected and tabulated. Their average turns to be 602 with standard deviation of 27.

Verify if the average score of DePaul MBA students is the same as the national average at the 5% significance level.

1. Via the confidence interval approach.

2. Via the critical value approach.

3. Via the p-value approach.