Question

Describe the definitions of 95% reference range and 95% confidence interval and list the computational formulas.​

Answer 1

ANSWER :

• In statistics, a confidence interval (CI) is a type of estimate computed from the statistics of the observed data.
• This gives a range of values for an unknown parameter (for example, a population mean).
• The interval has an associated confidence level that gives the probability with which an estimated interval will contain the true value of the parameter.
• The confidence level is chosen by the investigator. For a given estimation in a given sample, using a higher confidence level generates a wider (i.e., less precise) confidence interval.
• In general terms, a confidence interval for an unknown parameter is based on sampling the distribution of a corresponding estimator.

A rigorous general definition:

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