Question

Does the grade distribution change over the years (terms)? Generate two displays that will be used in your summary. GRADE DISTRIBUTION CHANGE OVER YEAR 20 18 16 14 12 10 绘图区 GRADE A GRADE B GRADE C 201140 201240 201340 201440 1 2015401 2016401 2017402

please help me to do summary

Answer 1

From given graph, Observe the numaric values for GRADE A , GRADE B, GRADE C are,

Grade A	Grade B	Grade C
7	2	1
15	4	2
13	9	6
19	6	1
11	5	2
13	5	1
15	4

We use Minitab for summary of above data.

MTB > Describe 'Grade A' 'Grade B' 'Grade C';
SUBC>   Mean;
SUBC>   SEMean;
SUBC>   StDeviation;
SUBC>   Variance;
SUBC>   QOne;
SUBC>   Median;
SUBC>   QThree;
SUBC>   Mode;
SUBC>   Minimum;
SUBC>   Maximum.

Descriptive Statistics: Grade A, Grade B, Grade C

Variable   Mean    SE Mean StDev Variance Minimum     Q1    Median     Q3 Maximum    Mode
Grade A   13.29     1.41    3.73     13.90    7.00 11.00    13.00 15.00    19.00    13, 15
Grade B   5.000    0.816 2.160     4.667    2.000    4.000    5.000    6.000    9.000      4, 5
Grade C   2.167    0.792 1.941     3.767 1.000     1.000    1.500 3.000    6.000    1