Statistics and data analysis

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  1. What is meant by confidence interval in data analysis e.g. 95% confidence interval?
  2. How does p<0.05 estimate significant difference?
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  1. An interval, based on a sample, which has a $95$% probability of containing the unknown population parameter. Note that the interval is variable, but the unknown parameter is fixed.
  2. Not sure what you mean. the word "significant" is used to describe the p value of 5%, just like "highly significant" is associated with a p value of 1%.