Pitch Assignment Report Sample

The design engineers can use Minitab to obtain useful statistic information about a material. ZMD, a commercial aircraft company-manufacturing aerospace, provided some design specifications for a particular bolt. The specifications defined by the Aircraft series 900 for ZMD is a tensile strength of 17.4kN. The requirement for the supplier parts by the Quality and the Manufacturing department is the conformation to a performance level of 99 percent with respect to the specifications of each part. Descriptive statistics incorporated into probability plot aided in the testing of the data.
The statistic results portrayed a population of 18.324 KN with a population variance of 0.449KN. Additionally, the results for the standard deviation provided a value of 0.670KN. The range for the test was 3.651KN.The provided data on the strength of the bolt aided in the construction of a histogram. The data of high frequency on the tensile strength was evident because the range ran between 18KN and 18.6KN. The test for the typical conformation of the probability distribution followed. As such, the normal distribution fit, which is bell-shaped, was perfect for the fitting. However, there were parts that went out of the peak of the curve.
The application of the probability plot provided a confidence interval of 95% that aided in fitting of the standard distribution. As such, it was easy to draw the values for the tensile strength. The graph in Appendix 9 portrays percentile results that were less than 17.4KN. Additionally, there was a standard deviation of 0.670KN and a population mean of 18.324KN.The value along the X-axis of 17.4KN intersected the curve to mark a point for the probability of X at that point. The plotted results indicate that most of the test samples met the targeted goal for the design requirement. The plot results on the selected samples inform that 91.25% of them met the goal targeted that was at 17.4KN. However, the new level of the variation registered a value of 0.445KN. The standard deviation for the test was 0.670KN that also formed the new results data. The new numbers are unacceptable for a confidence interval of 99% of the bolts that will satisfy the design requirement of 17.4KN tensile strength. There is a discrepancy of 7.5% registered between the test results and the required target.
The ultimate mean strength for the population was 18.324KN as shown in the appendix of the descriptive statistics. The range for the tensile strength between the minimum and the maximum bolts was 3.651KN where the value for the minimum bolt was 16.135KN, and that of the maximum bolt was 19.785KN. The coverage for a percentile value of 25 was 17.976KN while a tensile strength of 18.802KN was in the percentile value of 75. The histogram plot shows a higher frequency of ranging between 18KN and 18.6KN. On the plot of the histogram, there was fitting of a perfect bell-shaped curve but there were unfitted data on the right tail and above the curve.
Anderson-Darling test indicates that for the P values greater than 0.05, the normal distribution is right for the fit of the data. The value, in this case, was 0.07 that is above the 95% significance; hence, the normal distribution was the right for the data. A 9% of the percentile of the probability data table was less than 17.42KN while a value of 0.915KN confirmed to X at 17.42KN. As such, 91.5% of the bolts conform to the data with 17.4KN tensile strength. There is no achievement of the strength requirement of the aircraft bolt manufactured by the ZMD Company. The client can ask the best bolt for another design or look for a different company. The tensile strength graph suggests need for another material with better capabilities.

Appendix

Descriptive Statistics: Ultimate Tensile Strength (KN)
Total
Variable Count Mean Standard Dev Variance Minimum Q1 Median Q3
Ultimate Tensile Strength 124 18.324 0.670 0.449 16.135 17.976 18.399 18.802
Variable Maximum Range IQR
Ultimate Tensile Strength 19.785 3.651 0.827
The graph shows the summary of tensile strengths versus the percentages. this shows the analysis of the ability of the strengths.