MHB Standard deviation, raw score etc

[saharalynne]

-3 SD -2 SD -1 SD 80 +1SD +2 SD +3 SD
mean
65 70 75 85 90 95

The test has a mean of 80, a standard deviation of 5 and a standard error of measurement of 3.
Information given: Mean = 80 SD = 5 SEM = 3 Jim’s score = 85

I need to know the raw score, observed score, true score, ci for 68 and 95

 

[I like Serena]

-3 SD -2 SD -1 SD 80 +1SD +2 SD +3 SD
mean
65 70 75 85 90 95The test has a mean of 80, a standard deviation of 5 and a standard error of measurement of 3.
Information given: Mean = 80 SD = 5 SEM = 3 Jim’s score = 85

I need to know the raw score, observed score, true score, ci for 68 and 95

Hi saharalynne! Welcome to MHB! (Smile)

The raw score is the original untransformed score, which is the same as the observed score.
We can never know the true score, since what we measure always contains an unknown error.

The confidence interval (CI) at confidence level 68% is the interval from Mean - SEM to Mean + SEM.
And the CI at confidence level 95% is the interval from Mean - 1.96 x SEM to Mean + 1.96 x SEM.

Can you tell what each of those are? (Wondering)