Each flagged question on a composite exam gets a decision in the NU524 Unit 7 report, from rekeying an item with a negative point-biserial to keeping one answered by 98 percent. Searches like "nu 524 unit 7 assignment example", "nu524 unit 7 sample" and "nu524 unit 7 example" land here.
What a finished NU524 Unit 7 item analysis report looks like
Seven pages with three tables and a one-page appendix of all fifty items. The summary table gives the exam statistics: mean 36.2 of 50, or 72.4 percent, standard deviation 7.64, KR-20 of .87 and a standard error of measurement of 2.71 points. The flag table lists every item outside the report's thresholds, difficulty above .90 or below .30 and a corrected point-biserial under .20: eleven items fall above .90, one below .30, and eleven carry weak discrimination. The distractor table covers the items that matter most. Item 23, on oxygen titration in COPD with chronic hypercapnia, was keyed B, yet option C drew 27 of the 48, including 9 of the top 13 scorers, and its point-biserial is -.24. The key is wrong, and C is defensible.
How a NU524 Unit 7 example is structured
Method first: how the analysis was run, which statistics were computed, and the thresholds chosen, with the reasons for each. The corrected point-biserial removes each item from the total before correlating, which matters on a fifty-item exam, and the upper and lower groups are the top and bottom 27 percent, thirteen students each. Results follow at two levels, the exam as a whole and then flagged items. Each flagged item receives a short paragraph ending in one of four decisions: keep, revise, replace a distractor, or rekey. Item 23 is rekeyed and the exam rescored, which moves that item's difficulty index to .56 and KR-20 to .88, and the report notes that rescoring changes grades and was approved by the course lead. A closing section warns that forty-eight students make every statistic unstable, so decisions stay provisional until the next administration.
Thresholds stated before results
Difficulty between .30 and .90 and a corrected point-biserial of at least .20 are the report's working lines. Stating them first prevents the thresholds from bending to fit whatever the data showed.
Item 23, rekeyed
Strong students chose C, the option current COPD guidance supports, while the recorded key B drew mostly weaker students. Rekeying moves the item's difficulty to .56 and nudges KR-20 from .87 to .88.
A 98 percent item kept on purpose
Item 36 checks two patient identifiers before a heparin infusion. It discriminates poorly, at .16, but the report keeps it because the behavior is non-negotiable and the item documents that it was tested.
Two rewrites and a dead distractor
Item 32, a potassium range answered by everyone, becomes an application item. Item 48 shows almost no discrimination, at .04, and its stem is rewritten. Item 14's option C drew nobody and is replaced.
Why forty-eight students limit certainty
With groups of thirteen, one student changes an item's discrimination noticeably. The report calls its decisions provisional and schedules a second look after the next cohort sits the revised exam.
Where marks go in NU524 Unit 7
Numbers without decisions are this assignment's classic shortfall: a table of p-values and point-biserials that ends there has described the exam without improving it. Misread statistics cost accuracy, such as treating a high difficulty index as a hard item, when p is the proportion answering correctly. A negative point-biserial reported without examining the key or the distractors misses the most important finding an analysis can make. Deleting every easy item mechanically ignores why some are there, and instructors tend to reward the reasoned exception. KR-20 interpreted as validity rather than internal consistency invites correction. Reports that ignore small-sample instability overstate their conclusions. Rescoring decisions made without noting their effect on grades, or without approval, leave out part of the professional judgment the course asks for.
Get a NU524 Unit 7 example written to your instructions
Item analysis needs data, so send the statistics your instructor provided or describe the exam so a composite data set can be generated. Include the Unit 7 assignment and rubric. First samples cost nothing, arrive within 24-48h, and show the calculations, so every figure can be checked against the formulas your course uses.
NU524 Unit 7 questions, answered
What does a negative point-biserial mean?
That students who scored lower on the whole exam were more likely to answer the item correctly than those who scored higher. It usually signals a miskey, an ambiguous stem or a distractor that attracts strong students for a good reason. Item 23 here had a corrected point-biserial of -.24, and the distractor table showed the recorded key was wrong.
How is KR-20 different from the item statistics?
KR-20 estimates the internal consistency of the exam as a whole for items scored right or wrong, while difficulty and point-biserial describe individual items. The report gives .87, a comfortable figure for a classroom exam. It is a reliability estimate, not evidence that the exam measures the right things, a distinction many reports blur.
Should very easy items always be removed?
No. An item answered correctly by nearly everyone discriminates poorly, but it may test something every student must know. The report keeps a patient identification item answered by 98 percent for exactly that reason and says so. Easy items that test trivia, like the potassium range, are rewritten instead.