MINITAB
(for QCAR and SIXSIGMA courses)
ASSIGNMENT - 1
1. Develop a box and whisker plot from the data given below to analyses the daily ATM usage data at two
locations of the university campus – North Gate and South Gate. Interpret the plot and draw some conclusion.
Sl.
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Location
North
South
North
South
North
South
North
South
North
South
North
South
North
South
North
South
North
South
North
South
North
South
Daily ATM
Usage
125
260
101
215
144
249
150
149
147
160
136
190
102
237
117
195
102
182
132
237
131
168
(Hint: Two box plots for comparison between two locations has to be drawn)
Data Filled in Minitab
Two box plots
For South Location
Q1 = 168
Q3 = 237
Interquartile range = Q3-Q1
IQ range = 237 - 168 = 96
Median = 195
Whiskers to : 149,260
N = 11
For North Location
Q1 = 102
Q3 = 144
Interquartile range = Q3-Q1
IQ range = 144 - 102 = 42
Median = 131
Whiskers to : 101,150
N = 11
2. The owner of a Taxi service has selected a sample of customer trip and has recorded the data on three
variables: Distance in Miles, Trip Duration in minutes, and Tip amount to Driver. These data are as follows:
Trip
Distance (miles)
1
2
3
4
5
6
7
8
9
10
4.2
8.7
0.9
3.3
13.5
5.3
4.0
11.7
2.1
1.7
Data Filled in Minitab
Trip Duration (in
Minutes)
7.9
16.3
3.0
7.9
24.6
13.0
9.3
19.3
5.2
4.7
Tip to Driver (%
to Fare)
14.2
10
28
20
15.5
20.2
22
14.6
23
20
Scatter plot
(a) To better understand these data, the manager wants to know the relationship between the trip distance and
trip duration. Construct a Scatter plot and comment.
Matrix plot
(b) Also he wants to know the relationship between all the variables with each other. Construct a Matrix plot
and comment on the relationship between the variables.
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