Well, an updated curriculum would probably be a good idea. However, I'd like to point out the fact that the survey has a lot of questions designed to lead toward a certain answer. That leads to skewed statistical data.
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Yeah I noticed that. Also, if you only ask 4,000 hand picked parents, you can't seriously expect people to believe the statistics.
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4000 theoretically provides a good number, actually. More than 100 participants is usually just enough. The question is if it's random selection or not. And the results would only be valid for that area. But it's still a bad survey.