PART I: (35 marks) Lecturer: Dr. U.E Jumbo.

Instructions: Answer all the questions. Start each exercixe on a new page.

Exercise 1: (15 marks)

The office manager at a real estate firm makes a pot of coffee every morning. The time before it runs out, y,

in hours depends on the number of persons working inside that day, x. Suppose that the pairs of (x,y) values

from six days are:

X 1 2 3 3 4 5

Exercise 2: (20 marks)

To compare the effectiveness of two diets A and B, 150 infants were included in a study. Diet A was given to

80 randomly selected infants and Diet B to the other 70 infants. At a later time, the health of each infant was

observed and classified into one of the three categories “excellent”, “average”, and “poor”. From the

frequency counts recorded in the table below, we wish to test the null hypothesis that there is no difference

between the quality of the two diets.

Health under two different diets

Total

Excellent Average Poor

Diet

PART II: (35 marks) Lecturer: Dr. Dobdinga C.F

Instructions: Answer all the questions in this section.

Question one:

The following shows frequency of the distribution of annual earnings of a sample of MBa graduates.

Earnings 15 – 25 25 – 35 35 – 45 45 – 55 55 – 65 65 – 75 75 – 85 85 – 95 95 – 105

Frequency 3 4 11 14 21 16 14 9 8

a) Determine the sample mean, range and standard deviation.

b) What is the median and mode of the earnings.

LECTURER: DATE: 27/07/2016 HALL: DURATION: 3hours

UNIVERSITY OF BAMENDA

REPUBLIQUE DU CAMEROUN

Paix -Travail – Patrie

UNIVERSITE DE BAMENDA

P.O BOX 39 BAMENDA

TEL: 33 36 36 94

Question two

The following information gives a summary of the composition of workers in DCF University: