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Analysis of Covariance (ANCOVA)
ANCOVA is a method of measuring differences in dependent variables’ mean values that are associated with controlled independent variables’ effects. This technique takes into consideration the influence of independent variables that are uncontrolled. ANCOVA is used in marketing to understand the variation in consumer’s intention to purchase a specific brand based on the various levels of pricing and the client’s attitude towards that brand.
A Tukey’s test can also be called the Tukey's Honest Significant Difference (THSD) test. This post-hoc technique is founded on the studentized range distribution. While an Analysis of Variance can easily inform the researcher if overall the results are significant, it does not say the exact place the differences can be found. The Tukey's test on the other hand can tell you the particular group means that are different by comparing all possible pairs of means. It is for this reason that it is recommended that you run the Tukey's test after finding the significant results using ANOVA.
Estimating Process Capability
Process capability is a measure in statistics that caters to the variability of inherent processes of a specific attribute. This process is used to assess the capability of a process to meet a given specification. It is extremely difficult to know when a process has reached a state of equilibrium and if the chosen samples represent the process. Hence, measuring the process capability is more complicated.