The chi-square test is a statistical test commonly used to determine whether there is a significant difference between the expected and observed frequencies in a categorical data set. It is a goodness-of-fit test, which means that it is used to asse...
A contingency table is a tool used to summarize and analyze the relationship between two categorical variables. It is a type of cross-tabulation that displays the frequencies or counts of the combinations of categories for the two variables. To crea...
One-way ANOVA (Analysis of Variance) is a statistical test used to compare the means of three or more samples to determine if there are significant differences among them. It is based on the assumption that the samples are drawn from normally distri...
Quality is important for the success of any company. Quality experts like Joseph Juran, Philip Crosby, W. Edwards Deming, and Armand V. Feigenbaum have made big contributions to the field of quality, but their approaches are different in some ways. I...
The F Test for Equality of Variances between two groups is a statistical test used to compare the variances of two samples to determine whether they are equal. It is based on the assumption that the samples are drawn from normally distributed popula...
The Chi-Square Test for One Variance is a statistical test used to compare the variance of a sample to a known population variance. It is used to test a hypothesis about the population variance and is based on the assumption that the sample is drawn...
(also called Two Sample Z Test for Proportions) Two Proportions Z Test A two-proportions z-test is a statistical test used to compare the proportions of two independent samples. It is used to test a hypothesis about the difference between the propor...
Paired t-Test A paired t-test is a statistical test used to compare the means of two related samples or matched pairs. It is used to test a hypothesis about the difference between the means of the two samples. It is based on the assumption that the...
A two-sample t-test is a statistical test used to compare the means of two different samples to determine if there is a significant difference between them. It is based on the assumption that the samples are drawn from populations with normal distri...
A one-proportion z-test is a statistical test used to compare the proportion of a sample to a known population proportion. It is used to test a hypothesis about the population proportion and is based on the assumption that the sample is drawn from a...
