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For a given value of x, the interval estimate of the dependent variable y is called the prediction interval. Problem. In the data set faithful, develop a 95% prediction interval of the eruption duration for the waiting time of 80 minutes. Solution The 95% confidence interval for an effect will exclude the null value (such as an odds ratio of 1.0 or a risk difference of 0) if and only if the test of significance yields a P value of less than 0.05. If the P value is exactly 0.05, then either the upper or lower limit of the 95% confidence interval will be at the null value. Nov 06, 2016 · Learning objectives In this chapter you will learn: to estimate a population statistic using a sample statistic; to calculate and interpret 95% confidence intervals (CIs) for means and proportions; to interpret the difference between two means or proportions using a 95% confidence interval; the meaning of a P-value, and to derive P-values for differences in…