Content Quality Concerns:
The content is rather limited, the user cannot modify the important parameter such as sample size. Furthermore, it would be helpful to show the critical value in case students want to calculate and compare their answer to the right one. I think this applet would be more confusing than helpful for students. While the notation does follow generally accepted notation, it is presented visually in such a way that students will have a hard time connecting the applet to the formulas and notation they see in their textbooks.
Content Quality Strengths:
The applet can demonstrate how, in repeated hypothesis testing, some samples will give significant results just by chance.
Ease of Use Concerns:
Statistical notation is given in plain text, not as graphics or typeset, which may be hard for students to translate into the form they are accustomed to seeing in their textbooks and notes.
Ease of Use Strengths:
It is interesting that students can change both the hypothesized proportion and the population proportion.
Potential Effectiveness Concerns:
The usage is rather limited. The system does not help to develop more relevant statistical concepts. The tool is too simple to be used heavily. Instructions to students are limited and vague. Each dot apparently represents the z-statistic for the test, but that is not clearly stated in the explanation of the applet.
Potential Effectiveness Strengths:
This tool is very effective in demonstrating the components of the hypothesis test on the proportion.