Class size definitely has a serious effect on learning. With a larger class, the teacher may not be able to attend to all learners adequately.
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25-30 in a class in statistics
The class interval for each interval is the difference between its upper limit and its lower limit.
800 from my math class i know i am learning powers of ten
In general, the confidence interval (CI) is reduced as the sample size is increased. See related link.
i think it is just 7 we are learning about decimals in class at ksa (king Solomon academy) so i think it is 7 if you disagree then improve it thanks...