Question

The raw score distribution always assumes a: a. mean of 50 and a SD of 10             c....

The raw score distribution always assumes a:

a. mean of 50 and a SD of 10             c. mean of 0 and a SD of 1

b. mean of 100 and a SD of 15           d. none of these

I got this wrong on my test, I selected "C" as my answer and I don't understand why that was wrong. I thought I was understanding this...

Math   Statistics-And-Probability   
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Answer #1

You should choose (d) as your answer , because raw score have not any fixed mean and standard deviation .

The answer you have choosed (c) is for z- score , z score have mean 0 an a standard deviation 1

Explanation : Suppose you have data of height of the student in your class , these heights are raw score , whenever you subtract the mean and divide by standard deviation it becomes z score and then it is normally distributed

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