- A chemist in interested in determining the weight loss of aparticular compound as a function of the amount of time thecompound is exposed to the air. The data below give the weightlosses associated with settings of the exposure time.
                Weight Loss (inpounds)          Exposure Time (in hours)
       ____________________________________________________
                        4.0                                                4
                         6.0                                                5
                               2.0                                           3
                         .                                                  .
                                .                                                      .
                         9.0                                                6
       ____________________________________________________
        Use thecomputer printout (below) to answer thequestions.
* * * *Â Â L I N E ARÂ Â Â Â Â Â Â Â Â Â Â R E G R E S S I O NÂ Â * * * *
Dependent Variable:Â Â Â Â WeightLoss
Independent Variable: Exposure Time
                        Analysis of Variance
                             Sum of      Mean                            p
Sources    df     Squares    Squares         F         Value
-----------------------------------------------------------------------
Regression    1     70.417      70.417          Fobs        .000
Residual      10      SSres        MSres      Â
-----------------------------------------------------------------------
Total           11    84.917
---------- Variables in the Equation-----------
Variable                  B        SEB         t          pValue  Â
Exposure Time   2.167      0.311      6.969      0.000     Â
(Constant)Â Â Â Â Â Â Â Â Â -5.833Â Â Â Â Â Â 1.745Â Â Â Â Â -3.343Â Â Â Â Â Â 0.007
       8     points
         (a)     Why do we need to use linearregression analysis in this study?
TYPE YOUR ANSWERS BELOW:
             (1)
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             (2)
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           Â
       Â
        (b)    Briefly describe the concept ofleast-squares regression line.
TYPE YOUR ANSWER BELOW:
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       Â
         (c)    Why this study is called simple linearregression analysis instead
