Chapter1&0
(Business Statistics 107 Exercises and
Summary )
1-A shop sells five different types of laptops to its
customers. How would you classify “types of
laptop sold” as a variable?
Explain your answer
Types of laptop sold is a categorical variable.
Which of the following statements justify your
choice above?
A.The type of laptop sold is of this type of a variable
because the values of the variable arise from counting
processes
B.The type of laptop sold is of this type of a variable
because the values of the variable represent
quantities.
C.The type of laptop sold is of this type of a
variable because the values of the variable can be
placed into categories.
D. The type of laptop sold is of this type of a variable
because the values of the variable arise from
measuring process
2-Classify each of the following variables as
categorical or numerical. If the variable is
numerical, determine whether the variable is
discrete or continuous.
a) Number of medical patients in a hospital
waiting room
b) Weight of a package of Sun-Maid raisins
c) Car body styles
a) Number of medical patients in a hospital
waiting room is what kind of variable?
A. Numerical, discrete
B. Numerical, continuous
C. Categorical
b) A weight of package of Sun-Maid raisins is
what kind of variable?
A .Numerical, discrete
B .Numerical, continuous
C. Categorical
c) Car body styles is what kind of variable?
A .Numerical, discrete
B. Categorical
C. Numerical, continuous
3-Suppose that you measure the time it takes to
download a video from the internet.
Explain why the download time is a continuous
numerical variable.
Choose the correct answer below.
A. Download time is a continuous numerical variable
because it has numerical values that arise from a
counting process.
B. Download time is a continuous numerical
variable because it has numerical values that arise
from a measuring process.
Your answer is correct.
C. Download time is a continuous numerical variable
because it has values that can only be placed into
categories
4-Would you use a sample or a census to measure
each of the following?
a) The make of the car driven by members of your
study group
b) The make of the car driven by students in your
university
c) The mean battery life of your laptop when it is
in continuous use
d) The number of students in your statistics class
who brought laptops to class today
(a) The make of the cars driven by members of
your study group is a census.
(b) The make of the cars driven by students in
your university is a sample.
(c) The mean battery life of your laptop when it is
in continuous use is a sample.
(d) The number of students in your statistics class
who brought laptops to class today is a census
5- You are conducting a study to find out the age
group of people who prefer to watch action movies
in a movie theatre. Fill in the blanks with the type
of sample required in each case.
a) You survey the first 50 persons to emerge from
the theatre hall. To do this, you will be using the
Convenience sampling technique
.
b) You survey every fifth person to emerge from
the theatre hall. Here the systematic sampling
technique is required.
Column
Row
00000
11111
11112
22222
22223
33333
33334
12345
12345
67890
12345
67890
12345
67890
28
06873
75593
41373
49502
17972
82578
16364
29
12478
99659
31065
83613
69889
58869
29571
30
57175
65411
42547
70457
03426
72937
83792
31
91616
80103
07831
59309
13276
26710
73000
32
78025
14621
39044
47450
03197
12787
47709
Click the icon to view the table of random numbers
For a population of N 901, starting from row 03
and cclumn 01 of the accompanying table of
random numbers, determine the number of rows
required in order to select a sample of n 10
without replacement
143row(s) and the last sample value will be 1It will require
For a population of N=902, starting from row 02
and column 01 of the accompanying table of
random numbers, determine the number of rows
required in order to select a sample of n= 10
without replacement
856row(s) and the last sample value will be 1it will require
For a population of N=909, starting from row 02
and column 01 of the accompanying table of
random numbers, determine the number of rows