16.A view that “Anything can be taught at any stage of development” was proposed by

17.A researcher obtained a correlation coefficient of 0.70 between variables X and Y. This means that variance common to both the variable is

18.An investigator approached the nearby schools and collected data from those which cooperated. Such a sample is termed as

19.An investigator found that his research tool had high reliability. He can conclude that his tool

20.Make tabs are