1. Find the critical values rounding to three decimals 2. Compute the test statistic rounding to three decimals

T scores: Scores on the math SAT are normally distributed. A sample of 27 SAT scores had standard deviation s=89. Someone says that the scoring s the SAT is designed so that the population standard deviation will be o=57. Do these data provide sufficient evidence to contradict this claim? Use the 0.10 level of significance