Analysis and Improvement of Statistical Data and Graphs

STATISTICS

TABLE OF CONTENTS
QUESTION 1...................................................................................................................................3
a. Classification of variable.........................................................................................................3
b. Calculate..................................................................................................................................3
c. 85 Percentile............................................................................................................................4
d. Graph of satisfaction level......................................................................................................4
e. Mean would be an appropriate measure of central location or not.........................................4
f. Drafting graph for suggesting presence of association among various variables....................5
g. Answering through pivot table................................................................................................5
h. Relationship between employee left and performance evaluation..........................................6
I. Suitability of graph for two numerical variable.......................................................................6
2...................................................................................................................................................6
2.a Tree Diagram.........................................................................................................................6
(b)................................................................................................................................................6
(c)................................................................................................................................................7
(d) Recommendations.................................................................................................................7
3. Briefly explaining graph about ways which could be improved.............................................7
3.a ...............................................................................................................................................7
3.b ...............................................................................................................................................8
3.c................................................................................................................................................8
4. Indicating that outcome would be biased or not.....................................................................9

QUESTION 1
a. Classification of variable
Variable Classification
Satisfaction level Ordinal variable
last_evaluation Ordinal variable
number_project Nominal variables
average_monthly_hours Continuous variable
time_spend_company Numeric variables
work_accident Nominal variables
left Nominal variables
promotion_last_5 years Nominal variables
department Discrete variables
salary Ordinal variable
b. Calculate
average_monthly_hours
Mean 201.035016341
Standard Error 0.407587886
Median 200
Mode 135
Standard Deviation 49.9074681515
Sample Variance 2490.755377296
Kurtosis -1.1372249186
Skewness 0.0522986033
Range 214