In a survey conducted by the education department, college teachers were asked if they frequently used interactive teaching learning methods. Table 7.15 shows software output. Treating these observations as a random sample from the population of interest,

(a) State a research question that could be addressed with this output.

(b) Interpret the reported confidence interval.

(c) Interpret the reported P-value.

TABLE 7.15 Sample Yes No Sample prop 1. Seniors 335 1200 0.2792 2. Juniors 425 1260 0.3373 estimate for p(1) - p(2): -0.058 95% CI for p(1) - p(2): (-0.021, -0.095)

Test for difference = 0 (vs not = 0): z = -3.13 P-value = 0.002