graphical method

Let us learn about graphical method

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The graphical method for valuating or estimating the parameters of accelerated life data includes generating 2 types of plots. 1st, the life data at each individual stress level are plotted on a probability paper apposite (appropriate) to the assumed life distribution i.e. Weibull, exponential, or lognormal. The parameters of the distribution at every stress level are then valuated from the plot. Once these parameters have been valuated at each stress level, the 2nd plot is created on a paper that linearizes the assumed life-stress relationship i.e. Arrhenius, inverse power law, etc.. The parameters of the life-stress relationship are then valuated from the 2nd plot. The life distribution & life-stress relationship are then combined to provide a single model that describes the accelerated life data.

The graph of y = x² – 2x – 3.
Solution:
Draw the graph which x-axis 1 cm = 1 unit and on y-axis 1 cm = 2 units. Assign values to x = –4 to 5 and calculate the Corresponding y values.
X -2 -1 0 1 2
X² 4 1 0 1 4
Y 5 0 -3 -4 -3
We plot the points (–2, 5),(–1, 0), (0, –3), (1, –4), (2, –3) on the graph sheet & we join these points by a smooth curve.