Percentages are regularly used in polls. More often than none, there is a margin of error associated with the poll results. Can you share with the class the definition of the margin of error as well as show an example. When performing tests of hypothesis,

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Percentages are regularly used in polls. More often than none, there is a margin of error associated with the poll results. Can you share with the class the definition of the margin of error as well as show an example.
When performing tests of hypothesis, one must select a level of significance. What would be the rationale for selecting a smaller level of significance (i.e. 1%) over using a larger level of significance (i.e. 10%)?
There are times when results of a study are statistically significant but not practically significant. Can you explain the difference between practical significance and statistical significance?
In hypothesis testing, one can choose to use the p-value approach rather than the traditional critical value approach. What is a p-value? How is it significant to hypothesis testing?
pick any two of them to be answered
not less than 30 words each answer.

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