id
instance
userid
uniqueid
attemptstate
questionsattempted
standarderror
difficultysum
measure
1
220
2
1110
inprogress
0
1.2
99
2.222
id
course
name
intro
attemptfeedback
highestlevel
lowestlevel
minimumquestions
maximumquestions
standarderror
startinglevel
220
1
Test for retrieve_standard_error()
intro asdf
attempt feedback
100
1
15
20
9.9
50