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DIGILIB :
GUIDE TO
STATISTICS

A Book For Beginner

Written by Amirah Othman

Preface

Guide to Statistics is written of the
highest quality to expose students about
the exercises on how to answer final
exam questions.

There are six chapters and each chapters
for structured questions. The answers are
provided for student's evaluation
purposes. This book is suitable for
polytechnic students or other higher
learning institution who take this subject.

This book is derived from the idea of
innovation from lecturers who teach this
subject where there is difficulty among
students to find revision questions. It is
our hope will be the main source of
reference in the learning process can
improve student's achievement in their
final examination.

Content

CHAPTER PAGES

Introduction to Statistics 4

Data Presentation 10

Measures of Central Tendency 24

Measures of Dispersion 36

Correlation and Regression 49

Probability 59

05 CHAPTER 5

CORRELATION AND
REGRESSION

FORMULA

QUESTION 1

a)The survey result of the average monthly
rents (in RM) for one-bedroom apartments
and two-bedroom apartments in randomly
selected metropolitan areas are shown in
Table 3(a) . Determine if there is a
relationship between the rents by using
Spearman rank correlation coefficient.

QUESTION 1

b) A doctor wishes to know whether there
is a relationship between a mother's
weight (in kg) and her newborn baby's
weight (in kg)

From the Table above, you are required to
a) Draw a scatter plot
b) Identify the regression equation , y= a+bx
by using least square method

QUESTION 2

a) The following is a set of data based on a
sales report from Marion Ltd showing the
relationship between the operation cost per
unit and the quantity sold by the company.

Based on the data given, find the Spearman's
ranking correlation coefficient.

QUESTION 3

a) The table below shows the monthly income
, y and years of education , x of seven
randomly selected employees from a certain
firm in Perda, Penang.

a) Identify the Spearman's rank correlation
coefficient between monthly income,y and
years of education, x.
b) Briefly explain on the results.

QUESTION 4

The manager of a sport shop assumed that
the customer's spending. (RM'000) per month
depends on the income (RM'000). A study on
sevel customers gives the following results.

a) Determine the simple linear regression
equation using the least squares method.

b) Determine the estimated monthly spending
of a customer if his customer is RM 2,450.00

QUESTION 5

a) The marks of 10 students in English and
Mathematics tests are as follow:

You are required to
a) Draw a scatter diagram for the above data.
b) Identify the Spearman's rank coefficient of
rank correlation.
c)Explain the results based on the answer
obtained in (b)

Answer

SCAN ME