The following are the summary data on proportional stress limits for specimens constructed using two different types of wood: Type of Wood Sample Size Mean Standard Deviation Red oak 14 8.48 0.79 Douglas fir 11 6.65 1.28 Assuming that both samples were selected from normal distributions and have unequal variances, carry out a test of hypothesis to decide whether the true average proportional stress limit for red oak joints exceeds that for Douglas fir joints by more than 1 MPa. Use a=0.05. (1) Critical Value (Round off to 3 decimal places): (2) Test Statistic (Round off to 2 decimal places): (3) Conclusion: (Type 'Reject HO' or 'Fail to Reject HO')