Statistics Case study : Tabulating the results by ClassOf1

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									              Sub: Statistics                                                                            Topic: Case study



              Question:
              Write a report on the following and do a table of your results and plot those
              results.

          ClassOf1 provides expert guidance to College, Graduate, and High school students on homework and assignment problems in
                        Math, Sciences, Finance, Marketing, Statistics, Economics, Engineering, and many other subjects.

              The maximum number of points that can be accumulated is 30. Note that a few students have
              more, because of extra credit. Also, there is some work returned ungraded that has not been
              re-submitted yet.

              3.32, 30.39, 30.3, 30.1, 29.69, 29.59, 29.49, 29.45, 29.29, 29.19, 28.47, 28, 27.48, 26.8, 25.09,
              24.89, 24.57, 23.48, 22.98, 20.47, 19.98, 17.88, 16.98, 16.49, 16.45, 14.19, 13.5, 13.3, 12.6,
              12.2, 6, 5, 4, 0.39, 0, 0, 0, 0, 0, 0.

              This is an exercise in predicting grades.

              1. Force this grading into a normal distribution. What grades would get, A, B, C, F under this
              circumstance? This method is commonly called "grading on a curve" or "curving the grades".

              2. Grades of 0, zero, this late in the term, are a cause of some consternation. It's rare that a
              student has been working and has that grade. Often there is some mix-up in some bureaucracy,
              so the Army, UMUC, something. Thus, it's reasonable to assume that they are outliers. Thus,
              eliminate them and again determine grades that the active students would get.

              3. Now, let's grade according to the Syllabus. This requires some easy extrapolation. Predict
              grades on this basis. Compute also the mean, median, and modal grades, and the standard
              deviation.

              Do a table of all of your results. Plot those results as you think appropriate.

              Which grading method do you think is "fair"?

              Present your results as a report. I don't care about format, as long as it's professional. Thus, if

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*The Homework solutions from ClassOf1 are intended to help the student understand the approach to solving the problem and not for submitting the same in
                                                      lieu of your academic submissions for grades.
              Sub: Statistics                                                                            Topic: Case study


              there is a standard format for your academic discipline, use it. Otherwise use ALA or anything
              else that is self-consistent. There must be at least three references other than our textbook,
              and they must be "refereed", so things like Wikipedia won't do.

              The report can be any length. It's a professional report. I'm the customer. I want the
              information I requested in a form that I, and my vice-presidents, who are not statisticians, can
              understand.

              We don't want empty "filler". We do like attractive and readable graphics. The report must be
              submitted to your Assignment Folder by the due date, which also is the lock date, or you won't
              get paid. We won't return the report for re-submission.

              You get credit for what you give us on the first submission. You are encouraged to discuss the
              work in the appropriate Study Group. The final computations and submission, however, must
              be entirely your own.


              Solution:
              1.

                   S.N.     Number Percentile Grade_Type
                    1        3.32    0.11          F
                    2        30.39   0.88         B
                    3        30.30   0.88         B
                    4        30.10   0.87         B
                    5        29.69   0.87         B
                    6        29.59   0.86         B
                    7        29.49   0.86         B
                    8        29.45   0.86         B
                    9        29.29   0.86         B
                    10       29.19   0.86         B
                    11       28.47   0.84         B
                    12       28.00   0.83         B
                    13       27.48   0.82         B

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*The Homework solutions from ClassOf1 are intended to help the student understand the approach to solving the problem and not for submitting the same in
                                                      lieu of your academic submissions for grades.
              Sub: Statistics                                                                            Topic: Case study



                   14         26.80          0.80               B
                   15         25.09          0.76               C
                   16         24.89          0.75               C
                   17         24.57          0.74               C
                   18         23.48          0.71               C
                   19         22.98          0.69               D
                   20         20.47          0.61               F
                   21         19.98          0.59               F
                   22         17.88          0.52               F
                   23         16.98          0.49               F
                   24         16.49          0.47               F
                   25         16.45          0.47               F
                   26         14.19          0.39               F
                   27         13.50          0.37               F
                   28         13.30          0.36               F
                   29         12.60          0.34               F
                   30         12.20          0.32               F
                   31         6.00           0.16               F
                   32         5.00           0.14               F
                   33         4.00           0.12               F
                   34         0.39           0.07               F
                   35         0.00           0.06               F
                   36         0.00           0.06               F
                   37         0.00           0.06               F
                   38         0.00           0.06               F
                   39         0.00           0.06               F
                   40         0.00           0.06               F

              2.

               S.N.       Number           Percentage         Grade_Type
                        1    3.32             0.03                   F
                        2   30.39             0.86                  B
                        3   30.30             0.86                  B

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*The Homework solutions from ClassOf1 are intended to help the student understand the approach to solving the problem and not for submitting the same in
                                                      lieu of your academic submissions for grades.
              Sub: Statistics                                                                            Topic: Case study



                       430.10    0.86            B
                       529.69    0.84            B
                       629.59    0.84            B
                       729.49    0.84            B
                       829.45    0.84            B
                       929.29    0.83            B
                      1029.19    0.83            B
                      1128.47    0.81            B
                      1228.00    0.80            B
                      1327.48    0.78            C
                      1426.80    0.76            C
                      1525.09    0.70            D
                      1624.89    0.69            D
                      1724.57    0.68            D
                      1823.48    0.63            F
                      1922.98    0.61            F
                      2020.47    0.51            F
                      2119.98    0.48            F
                      2217.88    0.39            F
                      2316.98    0.36            F
                      2416.49    0.34            F
                      2516.45    0.34            F
                      2614.19    0.25            F
                      2713.50    0.23            F
                      2813.30    0.22            F
                      2912.60    0.20            F
                      3012.20    0.19            F
                      31 6.00    0.06            F
                      32 5.00    0.05            F
                      33 4.00    0.04            F
                      34 0.39    0.01            F
               S.N.   Number Percentage Grade_Type Grade_Point Grade_Syllabus
                    1    3.32   0.03         F            0.13 F


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*The Homework solutions from ClassOf1 are intended to help the student understand the approach to solving the problem and not for submitting the same in
                                                      lieu of your academic submissions for grades.
              Sub: Statistics                                                                            Topic: Case study



                       2       30.39          0.86                B         
								
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