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Dcis 202:Statistical Data Analysis Question Paper
Dcis 202:Statistical Data Analysis
Course:Diploma In Computer Science
Institution: Kenya Methodist University question papers
Exam Year:2015
KENYA METHODIST UNIVERSITY
END OF 1''st ''TRIMESTER 2015 (PT) EXAMINATION
FACULTY : COMPUTING & INFORMATICS
DEPARTMENT : COMPUTER SCIENCE
UNIT CODE : DCIS 202/DBIT 220
UNIT TITLE : STATISTICAL DATA ANALYSIS
TIME : 2 HOURS
INSTRUCTIONS:
Answer question One and Any other Two questions.
Question One: (30 marks)
Define the following terms
(3 marks)
Population
Sample
Inferential statistics
A random sample of 20 students had the following levels of IQ: 70, 60, 50, 101, 88, 95, 70, 107, 70, 101, 120, 40, 100, 70, 83, 70, 100, 107, 70, 101.
Calculate the quartiles
(4 marks)
Find the interquartile range
(1 mark)
List and explain the purpose of each data editor windows.
(4 marks)
The score that eight students got in Geography test were, 60, 80, 93, 50, 80, 67, 88, 79. Calculate the standard deviation.
(5 marks)
Describe three limitations of statistics
(3 marks)
State and briefly explain four types of sampling.
(8 marks)
Differentiate between correlation and regression.
(2 marks)
Question Two (15 marks)
Explain the importance of the following menus in SPSS
(2 marks)
Transform
Data
Below is a frequency distribution of the weights of 140 students joining a certain university:
Weight (pounds) Frequency
80-89 4
90-99 23
100-109 49
110-119 38
120-129 17
130-139 6
140-149 3
Plot a histogram
(2 marks)
Plot an ogive
(2 marks)
Using the diagram in (i) and (ii) find the mean, mode and the median.
(3 marks)
Given the data below, find the regression line relating X and Y
(3 marks)
X 1 2 3 4 5
Y 1 1 2 2 4
Question Three
State two benefits of statistics.
(2 marks)
State two methods than can be used to collect data.
(2 marks)
What are outliers?
(1 mark)
A test of mechanical aptitude was given to seniors at MiddleCentre High School.
80 73 51 81 46 85 84
75 44 84 77 95 48 88
50 35 52 93 43 59 63
47 66 55 58 62 51 75
86 82 89 51 77 73 59
Construct a grouped frequency distribution for the above data in order to have 13 classes with equal class intervals; including the cumulative frequency and the relative frequency.
(8 marks)
The total number of the frequency i.e. ?¦f.
(1 mark)
The length of the class interval i.e. width
(1 mark)
Question Four (15 marks)
What is meant by the following terms
(2 marks)
A measure of central tendency
Range
Presentation of data is broadly classified into two categories, name them
(2 marks)
Twenty five army inductees were given a blood test to determine their blood type. The data set is as follows constructing an ungrouped frequency distribution for the data.
(4 marks)
A B B AB O
O O B AB B
B B O A O
A O O O AB
BA A O B A
Calculate the sample correlation between the height of the father and the son, from the data given below.
(7 marks)
Height of the Father (x) 65 66 67 67 68 69 70 70
Height of the Son (y) 67 68 65 68 72 72 69 71
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