Documents Mean science score, Last year of secondary school First International Science Study, 1969.

Slide 1 Mean science score, Last year of secondary school First International Science Study, 1969 Pisa Math And Science Scores, 15-year olds, 2006 % of Graduate Degrees Awarded…

Documents Evaluating Data Reliability Validity –bias Reliability Consistency of Measurement –Changes in...

Evaluating Data Reliability Validity bias Reliability Consistency of Measurement Changes in Definition Changes in Record keeping Changes in public understanding Sampling…