Specimens of a light metal alloy, heat treated in various ways, were subjected to a hardness test and then their ultimate strengths were determined

Specimens of a light metal alloy, heat treated in various ways, were subjected to a hardness test and then their ultimate strengths were determined. The H row in the data table gives the Brinell

 hardness number and the U row in the data table gives the ultimate strength in the

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appropriate units.

         H        52        54        56        57        60        61        62        64        66            68

                     U        12.3    12.8    12.5    13.6    14.5    13.5    15.6    16.1    14.7         16.1

    H       69        70        71        71        73        76        76        77        80            83

    U       15        16        16.7    17.4    15.9    16.8    17.6    19        18.6         18.9

  1. Using appropriate software plot a graph of this data.  ( H on the “x-axis” ,

      plot from 50 to 90, and U on the “y-axis” , plot from 11 to 20).

  • Determine the line of linear regression.
  •  Determine Pearson’s  coefficient of linear correlation.
  • Present your results in a ‘word’ document, and comment on your findings.

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