Question

Hi can anyone help me with this statistic question:

Form B has a standard error of measurement of 6 with a reliability of 0.84. What is the standard deviation for Form B?

Answer 1

"Stated verbally, in order to get an estimate of the SEM,
subtract the t e s t reliability from one, take the square root of
tha t difference, and multiply the square root value times the
standard deviation of the t e s t scores"

http://ncme.org/linkservid/6606715E-1320-5CAE-6E9DDC581EE47F88/showMeta/0/

Answer 2

\[S_e=\sigma\sqrt{1-r}\]

Answer 3

\[6=\sigma \sqrt{1-0.84}\]

Answer 4

is the answer 4?

Answer 5

dunno, what is 6/sqrt(0.16)?

Answer 6

if the website i linked is right, then id have to assume its 15. but i got no idea how to verify that.

Answer 7

I see your point on how to get the SEM, however with the inforamtion it is asking. It wants the answer to the SD not the SEM. So not sure about this answer.

Answer 8

i just solved the equation given for the SD after plugging in the relevant information.

Answer 9

the SEM is 6, the reliability is .84 , so i just plugged and played.

dunno how right it is tho.