tailieunhanh - Engineering Statistics Handbook Episode 9 Part 10

Tham khảo tài liệu 'engineering statistics handbook episode 9 part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . What intervals contain a fixed percentage of the population values ENGINEERING STATISTICS HANDBOOK hW tools raids search BACK Nixf 7. Product and Process Comparisons . Comparisons based on data from one process . What intervals contain a fixed percentage of the population values Observations tend to cluster around the median or mean Empirical studies have demonstrated that it is typical for a large number of the observations in any study to cluster near the median. In right-skewed data this clustering takes place to the left of . below the median and in left-skewed data the observations tend to cluster to the right . above the median. In symmetrical data where the median and the mean are the same the observations tend to distribute equally around these measures of central tendency. Various methods Several types of intervals about the mean that contain a large percentage of the population values are discussed in this section. Approximate intervals that contain most of the population values A Percentiles Tolerance intervals for a normal distribution Tolerance intervals using EXCEL Tolerance intervals based on the smallest and largest observations NIST SEMATECH HOME tools Alts search pBACK next http div898 handbook prc section2 5 1 2006 10 38 44 AM . Approximate intervals that contain most of the population values SEMMECH MOME rTOOLS IM SEARCH BACK NEXT http div898 handbook prc section2 2 of 2 5 1 2006 10 38 45 AM . Percentiles Example and interpretation For the purpose of illustration twelve measurements from a gage study are shown below. The measurements are resistivities of silicon wafers measured in . i Measurements Order stats Ranks 1 9 2 6 3 10 4 11 5 5 6 1 7 7 8 4 9 10 3 2 11 12 12 .