An educational researcher wants to know how susceptible a widely used reading test is to practise effects. The researcher administers the test to eight school children three times over a period of six...

An educational researcher wants to know how susceptible a widely used reading test is to practise effects. The researcher administers the test to eight school children three times over a period of six weeks (once every two weeks). The data are as follows (the dependent variable is score on the reading test where 1 = poor, 12 = good):

a) What conclusions can the researcher draw? Hint: perform a repeated measures ANOVA.

b) Calculate the correlation coefficients between the sessions.

c) Modify the data so as to increase the correlation coefficients between the sessions and repeat your earlier analysis (in question a). Report any changes you might observe.