Ten teenagers were given a general knowledge test on AIDS, and another 10 a test on drug-related behaviour. The scores on the two tests were as follows:
Knowledge of AIDS: 8, 1, 8, 6, 12, 9, 6, 5, 11, 13
Knowledge of drug-related behaviour: 91, 42, 98, 30, 18, 73, 84, 92, 45, 92.
a) Calculate the mean score of the group on each test.
b) Calculate the variance and standard deviation of the two tests.
c) On which test is there more variability?
d) Find the median for each test.
e) State whether each test is positively skewed, negatively skewed, or symmetrical.