Stat-101, Quiz 1 – Second 1431/1432
Majmaa’ah University
Engineering College
Stat 101
16/4/1432
Name:
Group: 1
Academic Number:
Quiz (1)
1. Complete the following sentences
a. Statistics is a group of methods used to ............. , .................., .................... and
........................ data to make decisions.
b. A sample that represents the characteristics of the population as closely as
possible is called ……………………………………………
c. A variable that can assume any numerical value over a certain interval or intervals
is called ………………………………
d. Statistics has two aspects: ............................. and ...........................................
2. Explain whether each of the following constitutes a population or a
sample?
a. A group of 40 patients selected to blood test
b. Ages of all students of in Civil Engineering Department at Majmaah University.
c. . Number of cars owned by 40 families selected from Almajmaah city.
d. Goals scored by all Football national teams participated in World Cup 2010.
1
Stat-101, Quiz 1 – Second 1431/1432
3. Indicate which of the following an example of a sample with replacement
is and which is a sample without replacement.


A box contains eight balls of different colours. A ball is drawn from this box,
its colour is recorded, and it is put back into the box before the next ball is
drawn, this experiment is repeated 5 times.
Ten students are selected from a statistics class in such a way that as soon as
a student is elected, his or her name is deleted from the list before the next
student is selected.
4. The following table lists five pairs of X and Y values.
X
Y
6
4
3
6
4
5
5
7
Compute the value of each of the following:
a)  x y2
d)  x3 y
2
2
8