STATISTICS AND DATA PROCESSING (CENP4116)
Computer Engineering - CEN
Semester: First Semester
Level: 400
Year: 2015
BSCP1202: STATISTICS AND DATA ANALYSIS
Date: 19/06/2015; Time: 08:00 - 10:00
Instructions; answer all questions
Question 1 (7 marks)
A large Agribusiness firm allows a discount on invoices that are paid within 30 days. Of all invoices,
10% received a discount. In a company, 12 invoices are sampled at random. What is the probability
that fewer than four of the 12 sampled invoices receive a discount?
Question 2 (13 marks)
a. Compute the correlation coefficient and the equation of the least-squares (regression)
line in y with respect to x of the data given in the following table. Interpret your
correlation coefficient.
x
53
43
73
63
103
83
93
y
4
6
8
10
12
14
16
b. When does confounding occur between two variables?
Question 3 (10 marks)
Consider the following observations of average income and total chicken sales for a 1-month period
for 8 different towns in Cameroon.
Town
Income (In Hundreds Of Francs CFA)
Chicken Sales (In Hundreds Of Francs CFA)
1
5
27
2
10
46
3
20
73
4
8
40
5
4
30
6
6
28
7
12
46
8
15
59
Determine the coefficient of determination, r
2
.
THE REPUBLIC OF CAMEROUN
Peace-Work-Fatherland
THE UNIVERSITY OF BAMENDA
COLLEGE OF TECHNOLOGY
DEPARTMENT: BASIC SCIENCES
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