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Could you please explain how to get the area(probabilty) from the table,when you have a d1 of say, 0.8215. My calculation always falls short of .0001 and this is how I do it:
I found the area(probability) corresponding to 0.82 as 0.2939. Then I found the area (probabilty)corresponding to 0.83 as 0.2967 . I calculated the difference the difference between these two probabilities 0.0028(0.2967-0.2939).Next I calculated the area of an extra 0.0015 to be 0.0004(0.0015/.01*0.0028). I then added this probability to that corresponding to 0.82 ie 0.2939 to get 0.2943(0.2939+0.0004).
The solution gave me an answer of 0.2944. It appears I’m missing something.The difference is purely due to rounding and is irrelevant for the exam. You would still get the marks is you just used the table figure for 0.82 and didn’t bother apportioning between the two figures!
It will obviously result in a slightly different final answer, but in AFM it is not the final answer that gets the marks – it is the workings that get the marks (which is why it is so important to set out your workings in a way that is easy for the marker to follow).
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