a professor wanted to estimate the mean g.p.a. of all csu students. to estimate that value, she took a sample of 8 csu students and recorded their g.p.a.s as shown below. 3.70 2.90 3.13 4.07 3.10 3.11 2.47 4.30 she used the sample results to calculate the sample mean and predict the g.p.a. of all csu students. though she did not know it, the mean g.p.a of all csu students is 3.53. what was the sampling error in this case? (round your answer to 3 decimals.)