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# interpret the confidence interval in context

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Unformatted text preview: Compute the margin of error, E. 5 Compute the 95% confidence interval. 6 Interpret your confidence interval in context. © 2011 THE CARNEGIE FOUNDATION FOR THE ADVANCEMENT OF TEACHING A PATHWAY THROUGH STATISTICS, VERSION 1.6, STATWAY™  ­ STUDENT HANDOUT STATWAY™ STUDENT HANDOUT | 5 Lesson 10.2.2 Confidence Intervals for a Population Mean Summary: Computing a Confidence Interval for a Population Mean  Verify that the normality criteria for sample means are met: either n > 30 or the population from which we are sampling is normal.  Determine the critical value, Tc, corresponding to the chosen level of confidence and the degrees of freedom.  Compute the margin of error, ! = !! ⋅  ! ! . Compute the confidence interval, ! − ! , ! + !  Interpret the confidence interval in context. The level of confidence is the proportion of intervals that contain the population mean, µ, and it is how confident we are that the interval contains the population mean. TRY THESE...
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