Tests of Differences between Proportions (4 of 5)

---

5. The probability computed in Step 4 is compared to the significance level stated in Step 2. Since the probability value (<0.0001) is less than the significance level of 0.05, the effect is significant.
   
   
6. Since the effect is significant, the null hypothesis is rejected. The conclusion is that the probability of graduating from high school is greater for students who have participated in the early childhood intervention program than for students who have not.
   
7. The results could be described in a report as:

   The proportion of students from the early-intervention group who graduated from high school was 0.86 whereas the proportion from the control group who graduated was only 0.52. The difference in proportions is significant, z = 4.69, p < 0.001.