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The page below is a sample from the LabCE course Linear Regression Analysis. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Formulae for Confidence Intervals

The formulae for regression confidence intervals are:

at the 95% confidence level, where:

Evaluating the plus sign in the above expressions gives the upper bound of the interval, and the minus sign gives the lower bound of the interval.