1 The Best Bolt Company Bolt-A report For the given data, the first quartile (Q1) is 17.976. This means that 25 percent of the data are less or equal to 17.976. In these results, there were N=124 samples and an average of the ultimate tensile strength of M= 18.324 kN as compared to the minimum specifications of 17.4kN. It is an indication that the Best bolt company meets the required minimum ultimate tensile strength. The median was 18.399, that is half of the data is less or equal to 18.399 and half of the data is equal or greater than 18.399. The variance and standard variance of the data were 0.449 and 0.6698 respectively, a suggestion that the data is widely spread about the mean. The mean and median indicates that the Best bolt company qualifies for the supplier of Bolt-A for aircraft-series-900. The histogram was used to assess the spread and shape of the data. Also, the data was more than 30, which made it easier to test normality. The data is normally distributed as indicated by the symmetric and bell-shaped curve as shown below. 2 Histogram (with Normal Curve) of "Ult_Tensile_Strengt Mean 18.32 StDev 0.6698 N 124 20 Frequency 15 10 5 0 16.2 16.8 17.4 18.0 18.6 19.2 19.8 "Ult_Tensile_Strengt The probability plot assessed normality of the curve, the shape and distribution of data in the plot is an indication that the data is normally distributed. The plot is shown below; 3 Based on the visual displays of the plots, the Best bolts company meets minimum specifications of 17.4kN for ultimate strength average. Therefore, the Best bolt company can supply ZMD with Bolt-A for Aircraft-series-900 design. The probability that a bolt picked at random will not comply with the requirements is given by {11/124} = 0.089. In every single bolt picked, chances that it will be below 17.4kN are 8.9 percent. For the Best bolt company to have 99 percent of bolt meet the strength specification, they first need to recognize and specify the sources of differences so that they may be reduced. The process is considered stable when running in a consistent and expected way. The Best Bolt can achieve this by controlling the variability and making the normal process constant. Finally, the Best bolt company should remove all sources from not set variation.
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