Use parametric tests to determine whether a population parameter differs from either a specified value or a different population parameter.
Determine whether the mean of a group differs from a specified value. In Minitab, choose
.Use a 1-sample z-test when you know the standard deviation of the population.
Determine whether the mean of a group differs from a specified value. In Minitab, choose
.Determine whether the means of two independent groups differ. In Minitab, choose
.You can use to compare measurements that are made on two different sets of items, such as satisfaction ratings from two different hospitals.
Compare measurements that are made on the same items under different conditions. For example, compare the diameter measurements of ball bearings by two operators. In Minitab, choose
.Determine whether the proportion for a group differs from a specified value. Use when each observation can have only one of two values, such as pass or fail. In Minitab, choose
.Determine whether the proportions of two groups differ. Use when each observation can have only one of two possible values, such as pass or fail. In Minitab, choose
.Determine whether the rate of occurrence for a group differs from a specified value. Use when you count occurrences, such as the number of defects per unit. In Minitab, choose
.Determine whether the rates of occurrence for two groups differ. Use when you count occurrences, such as the number of defects per unit. In Minitab, choose
.Determine whether the variance or the standard deviation of a group differs from a specified value. In Minitab, choose
.Determine whether the variances or the standard deviations of two groups differ. In Minitab, choose
.Use goodness-of-fit tests to determine whether a statistical distribution fits your data.
Determine whether your data follow a normal distribution. In Minitab, choose
.Use equivalence tests to determine whether the means for product measurements or process measurements are close enough to be considered equivalent.
Use nonparametric tests when you cannot assume that the data follow a specific distribution. .
Determine whether the median of a group differs from a specified value. Use when you have a small sample size and you are not confident that the data are symmetric. In Minitab, choose
.Determine whether the medians of two or more groups differ. Use when you are not confident that the groups have similarly shaped distributions. In Minitab, choose
.