Statistics linear transformation rescale

AI Thread Summary
To rescale a dataset with a mean of 25 and a standard deviation of 5 to a new mean of 100 and a new standard deviation of 20, a linear transformation can be applied using the formula xnew = a + bx. The necessary calculations indicate that multiplying the original values by 4 will achieve the desired mean and standard deviation. The confusion arises from understanding the transformation process, which can be clarified by careful study of the relevant material. Improving comprehension of the textbook content is essential for mastering these concepts. Mastery of linear transformations is crucial for accurate statistical analysis.
bcahmel
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Homework Statement


Mean of 25 and standard deviation of 5. Rescale the test using linear transformation so that the mean is 100?
and the standard deviation is 20...



Homework Equations


xnew=a+bx


The Attempt at a Solution


I don't know...15+4x? I really don't understand how to calculate this. I read my book and its useless! Any help? :)
 
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Where did you get the "15"? 4(25)= 100 and 4(5)= 20. Looks to me like you just want to multiply by 4.

"I read my book and it is useless"
Then you can do nothing to improve the situation.

"I have trouble understanding my book"
Then you can work on reading the book more carefully and improve the situation.

Which do you prefer?
 
well the first one is true but I'd prefer the second one.
 

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