question 2 Flashcards
how can a test be reliable and not valid? and not valid unless reliable?
a test can be reliable and not valid and not the other way around, because a test can do what it does over and over, but still not do what it suposed to do
explain what would a test be if it valid and
not reliable
If a test cannot do anything consistently, then it can’t do one thing consistently
when testing an hypothesis, what is important to test to ensure that the outcome is both reliable and valid?
because if you get a null result, you will never know that the tool is not measuring what it is supposed to measure or if the hypothesis is faulty
describe the differences between content, criterion and construct validity, with examples
content looks on the face of a test within an area/universe. is stats test content reflect stats book?
predictive=how well test predicts outcome how well GRE test predicts a good graduate??
content validity is when test asses an underlying theory
How are validity and reliability used in research?
your experiment will always be in doubt
What’s the overlap between statistics and validity/reliability?
statistics revolves around outcomes being measured, you need to reliability and validity to make sense of how behaviors/test scores/rankings/ratings are assessed.interpretation of data has consequences so statistics don’t mean anything unless we are confident that we know what we are looking at.
why can we not use the null hypothesis in research reports?
because it implied, and cannot be directly tested
what does not finding validity evidence mean?
your test is not doing what it should, and you need to redo the questions
what does not finding the criterion validity means?
need to re examine the NATURE OF ITEMS
what does not finding the construct validity means?
need to take a CLOSER LOOK @ THE UNDERLYING THEORY
why is NH a starting point?
because it is a statement of that states that given no other information, thisis what I will say. UNBIASED& OBJECTIVE
how is the normal curve and probability related?
the normal curve visually represents what possible outcomes (likehood) we can get in a given situation.
How do I know whether a distribution is negatively skewed?
when the scores are in the upper range
How do I know whether a distribution is positively skewed?
when the scores are in the lower range
How do I know whether a distribution is not skewed?
when the ditribution has equal lenght of tails and everyone scored the same.