The data from the experiment are used to evaluate the treatments. It is a special case of a gamma random variable.Īn experiment in which the treatments (experimental conditions) that are to be studied are included in the experiment. Chi-square (or chi-squared) random variableĪ continuous random variable that results from the sum of squares of independent standard normal random variables.The average number of samples taken in a process monitoring or inspection scheme until the scheme signals that the process is operating at a level different from the level in which it began.Ī graphical display of data in which the box contains the middle 50% of the data (the interquartile range) with the median dividing it, and the whiskers extend to the smallest and largest values (or some deined lower and upper limits).Ī horizontal line on a control chart at the value that estimates the mean of the statistic plotted on the chart. The portion of the variability in a set of observations that can be traced to speciic causes, such as operators, materials, or equipment. In hypothesis testing, an error incurred by rejecting a null hypothesis when it is actually true (also called a type I error). Key Statistics Terms and definitions covered in this textbook Chapter 7: Scatterplots, Association, and Correlation.Chapter 6: The Standard Deviation as a Ruler and the Normal Model.Chapter 5: Understanding and Comparing Distributions.Chapter 4: Displaying and Summarizing Quantitative Data.Chapter 3: Displaying and Describing Categorical Data.Chapter 21: More About Tests and Intervals.Chapter 20: Testing Hypotheses About Proportions.
Chapter 13: Experiments and Observational Studies.Chapter 10: Re-expressing Data: Get It Straight!.
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