histogram

Question 1

Whats x and Y axis

Answer 1

x=range of scores.
y=frequency score.

Question 2

standardised testing

Answer 2

discriminate people of differentiability.
scales met the criteria of testing-used in sufficient larger number of cases to test validity.?

given same test
compareresulys with normal population

z- score

Question 3

Symmetrical problems(eg now that bimodal symmetric histogram) shows in histograms

Answer 3

right positive skew- tail extend right test too hard.
left negative skew-tail left extend too easy.