The strength of concrete depends to some extend to some on the method used for drying. Two different methods were used, and the strengths of the concrete resulting from the two methods were measured. The data are given in the table below.         Method 1        56             105      62        89        73        95        62        59        68        83        64        77          Method 2        111           66        58        49        82        94        93        78        56        85   Test at the 1% level of significance whether the mean strength of method 2 is less than method 1.

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The strength of concrete depends to some extend to some on the method used for drying. Two different methods were used, and the strengths of the concrete resulting from the two methods were measured. The data are given in the table below.      

 

Method 1

       56             105      62        89        73        95        62        59        68        83        64        77

 

       Method 2

       111           66        58        49        82        94        93        78        56        85

 

Test at the 1% level of significance whether the mean strength of method 2 is less than method 1.

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