Tham khảo tài liệu 'engineering statistics handbook episode 9 part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . What is the relationship between a test and a confidence interval Equivalent confidence interval In fact all values bracketed by this interval would be accepted as null values for a given set of test data. NIST SEMATECH HOME TOOLS RAIDS SEARCH BACK NEXT http div898 handbook prc section1 2 of 2 5 1 2006 10 38 29 AM . What are outliers in the data Box plots with fences Outlier detection criteria Example of an outlier box plot A box plot is constructed by drawing a box between the upper and lower quartiles with a solid line drawn across the box to locate the median. The following quantities called fences are needed for identifying extreme values in the tails of the distribution 1. lower inner fence Q1 - IQ 2. upper inner fence Q2 IQ 3. lower outer fence Q1 - 3 IQ 4. upper outer fence Q2 3 IQ A point beyond an inner fence on either side is considered a mild outlier. A point beyond an outer fence is considered an extreme outlier. The data set of N 90 ordered observations as shown below is examined for outliers 30 171 184 201 212 250 265 270 272 289 305 306 322 322 336 346 351 370 390 404 409 411 436 437 439 441 444 448 451 453 470 480 482 487 494 495 499 503 514 521 522 527 548 550 559 560 570 572 574 578 585 592 592 607 616 618 621 629 637 638 640 656 668 707 709 719 737 739 752 758 766 792 792 794 802 818 830 832 843 858 860 869 918 925 953 991 1000 1005 1068 1441 The computatons are as follows Median n 1 2 largest data point the average of the 45th and 46th ordered points 559 560 2 J Lower quartile .25 N 1 .25 91 ordered point 411 .75 436-411 Upper quartile .75 N 1 91 ordered point 739 .25 752-739 J Interquartile range - J Lower inner fence - J Upper inner fence J Lower outer fence - Upper outer fence From an examination of the fence points and the data one point .
