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How are confidence intervals used in statistics? Why are they needed?

How are confidence intervals used in statistics? Why are they needed?

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The confidence intervals are used to find the interval that may contain the population parameters, such as population proportion and the population mean.

The confidence interval is calculated using the sample data and the confidence level, the confidence intervals can be used to test the hypothesis.

Since the detail of the population cannot be comprehended easily especially if the population size is very large, hence a random sample is taken and the confidence interval is calculated and using that confidence interval at the given confidence level the population parameters are estimated.

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