These can be solved using the Two Population Calculator. Sometimes we're interest in confidnece intervals about two population means. The calculator on this page solves confidence intervals for one population mean. Then, they use the 2-prop z Interval command. First they find the intervals by calculating the critical value and the margin of error. Hypothesis teting can be done using the Hypothesis Testing Calculator. In this activity, students use confidence intervals to estimate the difference of two population proportions. If the hypothesized value of the population mean is outside of the confidence interval, we can reject the null hypothesis. So, if we're constructing a confidence interval for the population mean (μ), we use the sample mean ($\bar $Ĭonfidence intervals is closely related to the statistical area of hypothesis testing. The point estimate is simply the sample statistic corresponding to the population parameter of interest. A confidence interval is made up of two parts, the point estimate and the margin of error.
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