Question: Independent random samples were taken from normal distributions of the yearly production of ships built by the International Ship Building Company under (1) a fixed-position layout and (2) a project layout. The results are given in the accompanying table. Test the null hypothesis that the mean for the fixed-position layout is equal to that for the project layout. Use .05 for the level of significance.

Fixed-position layout 8 0 1 5 1 5 1

Project layout 6 1 1 1 4 4 4