Year 1 Stat problem

• Sep 30th 2012, 03:53 PM
toby22
Year 1 Stat problem
Hello, I am not a math person but however the Stat course is compulsory for my program. I am trying my best but cannot figure this question. I will find a tutor in this week, but before that, please help me figure this out as my first test is coming in these days.

Suppose a distribution has a mean of 18 and a standard deviation of 4 and you transform this distribution to one that has a mean of 100 and a standard deviation of 10. What raw score in the original distribution corresponds to a transformed score of 115?

Thank you everyone for your help.
• Sep 30th 2012, 05:54 PM
richard1234
Re: Year 1 Stat problem
The transformed score of 115 is 1.5 standard deviations above the mean.

What score in the original distribution corresponds to this z-score?
• Oct 3rd 2012, 06:32 PM
toby22
Re: Year 1 Stat problem
so I get

x = 18 + (1.5 X 4)

= 24

am I correct?

Thanks a lot
• Oct 3rd 2012, 07:06 PM
richard1234
Re: Year 1 Stat problem
Quote:

Originally Posted by toby22
so I get

x = 18 + (1.5 X 4)

= 24

am I correct?

Thanks a lot

That's what I got.