Table 3.

Log-linear analyses of variation in student responses associated with academic level and frequency of in-class problems with clickers

Survey question	Change in fit of the log-linear model due to removal of the two-way interactions of each variable with each survey question
	Class problems	Academic level of course
Overall	x2 = 17.32, df = 4, p = 0.0017	x2 = 54.35, df = 2, p < 0.0001
Recommend clickers	x2 = 17.46, df = 4, p = 0.0016	x2 = 80.08, df = 2, p < 0.0001
Cost of clickers	x2 = 10.33, df = 4, p = 0.0352	x2 = 18.07, df = 2, p < 0.0031
Interaction preference	x2 = 9.27, df = 4, p = 0.0547	x2 = 54.35, df = 2, p = 0.0001