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Searched for: Statistical Topic is Statistical Inference and Techniques -- One Numerical Variable Methods -- Location
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View Resource The Student-t Test for Two Samples

This calculator computes summary statistics, the t-statistic, degrees of freedom (DF), and p-value for the Student t-Test. The user inputs values for two samples. The null hypothesis is that the populations have identical mean values.
View Resource Confidence Intervals

This applet introduces the concept of confidence intervals. Select an alpha level, sample size, and the number of experiments, and click "Play." For each sample, the applet will show the data points as blue dots and the confidence interval as a red, vertical line. The true population mean is shown as a horizontal purple line, and green ovals indicate which intervals do not contain the true...
View Resource Hypothesis Test Exercise

This exercise checks users hypothesis testing skills. Poems by the same author have on average 6.9 new words with a standard deviation of 2.7 words. A new group of poems has on average 8.2 new words. Were these new poems written by the same author? A calculator is provided which calculates probabilities and quantiles for the binomial, normal, Poisson, t, F, and Chi-square distributions.
View Resource IDEAL: Confidence Intervals for Paired Differences

This page provides two examples that illustrate confidence intervals for paired differences in means. Each exercise provides an applet which graphs the data and calculates the interval. The first example is about city murder rates, and the second is about preparation of tobacco leaves.
View Resource IDEAL: Confidence Intervals

This module contains an applet which illustrates factors affecting the width of confidence intervals for means. Users can manipulate the values of the population mean, population standard deviation, the sample size, and the level of confidence. Two follow-up examples, Cholesterol and Speed Of Light, further illustrate this concept.
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