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Ssst: 200: Introduction To Computer Interactive Statistics Question Paper

Ssst: 200: Introduction To Computer Interactive Statistics

Course:Computer Science And Engineering

Institution: Kenyatta University question papers

Exam Year:2010

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2010/2011
FIRST SEMESTER EXAMINATION BACHELOR OF SCIENCE COMPUTER SCIENCE AND SOFTWARE ENGINEERING
SSST: 200: INTRODUCTION TO COMPUTER INTERACTIVE STATISTICS

DATE: MONDAY 22ND NOVEMBER 2010

TIME: 8.00 A.M – 10.00 A.M

INSTRUCTIONS:

Answer Question ONE and any other TWO Questions
Q1)
a)
What is statistics?

(4 marks)

b)
Give at least three example of data collection problems that required prompt
action

(6 marks)

c)
The distance from my house to KU is 40 km. I drove to KU at a speed of 40 Km
per hour and returned home at a speed of 80 km per hour. What was my average
speed for the whole trip?

(4 marks)

d)
The distance from my house to KU is 40 km. I drove to KU at a speed of 40 km

per hour and returned home at a speed of 80 km per hour. What was my average

speed for the whole trip?

(4 marks)

e)
What is the difference between Primary and Secondary data?
(4 marks)

f)
What do you understand by data cleaning?

(6 marks)

Page 1 of 3

Q2)
a)
Quality control is a proactive measure taken to ensure proper data collection.
How can this be best demonstrated?

(6 marks)

b) Given the following hypothetical marks for the end of year total marks for the

second year statistics unit at KU,

Student: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Mark; 62 32 62 75 77 66 59 74 41 50 77 65 51 81 59

Student: 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Mark 59 56 46 69 61 51 54 55 73 73 71 45 67 62 70
a)
Sketch a line graph for the individual marks
b)
Give the range and range limits
c)
Give the median and mode scores if they exist
d)
Give the interquartile range
e)
Using the appropriate KU cut-off marks for the different grades, create a
frequency table from the above data
f)
Sketch a histogram from the table generated in e) above (14 marks)

Q3)
a)
How can the selection of data collection instruments comprise data

integrity?

(8 marks)

b)
You have just purchased a new 6 sided die and would like to see whether

it is biased (in combination with you when you roll it)

(12 marks)

i)
Use the standard equation to find the arithmetic mean.

ii)
Here are the numbers that you collect after a hundred throws:

1 5 6 4 1 3 5 5 6 4 1 5 6 6 4 5 1 4 3 6

1 3 6 4 2 4 1 6 4 2 2 4 3 4 1 1 6 3 5 5

4 3 5 3 4 2 2 5 6 5 4 3 5 3 3 1 5 4 4 5

1 2 5 1 6 5 4 3 2 4 2 1 3 3 3 4 6 1 1 3

6 6 1 4 6 6 6 5 3 1 5 6 3 4 5 5 5 2 4 4
iii)
Create a histogram to see if there is any significant difference in the
distribution of the numbers.
Page 2 of 3

Q4)
a)
Distributions can be grouped into two categories, name the two

categories giving 3 examples in each

(6 marks)

b)
What purpose do statistical test serve?

(4 marks)

c)
Explain the difference between significance testing and

hypothesis testing.

(10 marks)

Q5)
a)
A variety of sampling procedures are available to reduce the

likelihood of drawing a biased sample. List 3

(5 marks)
b)
Which questions should be addressed I the selection of instruments
to be used for data collection?

(5 marks)
c)
Consider a box with 3 coins, with probabilities of showing heads
respectively ¼. ½ and ¾. We choose arbitrarily one of the coins. After 5
throws, in which x=4 times heads came up. What is the probability that
the coin is coin number 1?

( 10 marks)

Page 3 of 3

Ssst: 200: Introduction To Computer Interactive Statistics Question Paper

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