The between subgroup variability is also known as long term capability is given as Pp and Ppk. The within subgroup variation is also known as short term capability and is indicated by Cp and Cpk. There are no out-of-control points in the control chart and the P value is greater than 0.05 so we can reject the null hypothesis of “The data is not normally distributed.” The data is suitable for a capability study. Enter the lower specification limit and the upper specification limit and click OK. Then either enter the column containing the subgroup or type the size of the subgroup. Enter the column containing the measurement values. Go to Stat > Quality Tools > Capability Sixpack > Normal. We can use the Minitab Capability Sixpack to determine if the data is normally distributed and in a state of statistical control. Before performing a transformation, we should determine if there is a reason the data do not fit any distribution. Seuss has never discussed transforming data so perhaps we should be hesitant if the data do not fit a distribution. But the data should also be normally distributed and in a state of statistical control otherwise, we either need to transform the data, or identify the distribution of the data and perform capability study for nonnormal data.ĭr. We should have a minimum of 100 values and 25 subgroups, which we have. We now have the results for the supper-zooper-flooper-do broom boom lengths, but can we trust our results? A capability study has requirements that must be met. Enter the lower specification limit and the upper specification limit, and click OK. Once the data has been collected, we can crank up our Minitab and perform a capability study by going to Stat > Quality Tools > Capability Analysis > Normal. We can anticipate more variation between material batches than within a material batch so we will use the batches as subgroups, with a sample size of four. The subgroups should be rational: that means the variability within each subgroup should be less than the variability between subgroups. A capability study should have a minimum of 100 values and 25 subgroups. Each day the supper-zooper-flooper-do factory produces supper-zooper-flooper-do broom booms with a change in broom boom material batch every 50th part. First we need to plan the capability study. It’s time for a capability study, but don’t fire up your Minitab Statistical Software just yet. Perhaps the fourth supper-zooper-flooper-do broom boom will be out of specification. The quality engineer has checked three supper-zooper-flooper-do broom booms and all were in specification, so he concludes that there is no reason to worry about the process producing out of specification parts. The broom boom length drawing calls for a length of 55.0 mm with a tolerance of +/- 0.5 mm. Let’s assume the broom boom length was the most critical dimension on the supper-zooper-flooper-do. Seuss fails to tell us where the supper-zooper-flooper-do came from and if the production process was capable. Plunger “ keeps the whole school clean” using a supper-zooper-flooper-do. Plunger who is the custodian at Diffendoofer School on the corner of Dinkzoober and Dinzott in the town of Dinkerville.
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