statistics 2

Research and statistics for managerial decision making

Assignment 2

Mohammed Ahmed Ali 0170026

2.31 Construct a stem-and-leaf display, given the following data from a sample of mid-term exam scores in finance:
54
69
98
93
53
74

I first took the numbers and placed them as a stem (5,6,7 and 9) then I placed the second number (3,4,9,4,3 and 8) and grouped them under the leaf section. I grouped the number with the same stem together.
MIDTERM EXAMSCORES

STEM
LEAF
5
3 4
6
9
7
4
9
3 8

2.44 The following is a set of data from a sample of n= 11 items:
X:
7
5
8
3
6
0
2
4
9
5
8
Y:
1
5
4
9
8
0
6
2
7
5
4

a. Construct a scatter plot. Show your work

a. Is there a relationship between X and Y? Explain
As all the points are scattered over the graph area and are not following a particular pattern we can conclude that there is no relationship between X and Y.

2.16 The following data is about the cost of electricity (in $) during July 2012 for a random sample of 50 0ne-bedroom apartments in a large city.
96
171
202
178
147
102
153
197
127
82
157
185
90
116
172
111
148
213
130
165
141
149
206
175
123
128
144
168
109
167
95
163
150
154
130
143
187
166
139
149
108
119
183
151
114
135
191
137
129
158

a. Construct a frequency distribution and a percentage distribution that have class intervals with the upper class boundaries $99, $119, and so on
First I organized the data in order on excel
95
96
102
108
109
111
114
116
127
128
129
130
130
135
137
139
144
147
148
149
149
150
151
153
158
163
165
166
167