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Video Session
Scan the QR code or visit the following link to watch the video:
Scales of Measurement in Statistics - Nominal, Ordinal, Interval, Ratio | Level of
Measurement - https://www.youtube.com/watch?v=3BuJjrLDsNY
Brainy Fact
Some interesting facts about data:
• 91% of the data used in data science is of string data type, around 41% of the data is derived from public
data, 33% is images, 15% is video, and 11% is audio data.
• Every year, an estimated 1 trillion photos are taken and billions of them are shared online. Around 80% of
the photos are taken through smartphones and most become searchable data online.
Reboot
1. Determine the level of measurement for the following data:
a. Motions of Debate (For, Against)
b. Grade in Music in School (A+, A, B…)
c. Feedback of a product (scale of 1 – 5)
d. Electric Charge
e. Smartphone preference (iPhone, Samsung, One plus, Xiaomi)
f. Number of pizzas you can eat in a day
2. State True or False.
a. All ordinal measurements are also nominal
b. All interval measurements are also ordinal.
c. The number of students in a school is a continuous variable.
d. Temperature is an example of an interval level of measurement.
e. All ratio measurements are also interval.
Data Matrix and Frequency Tables
As data is collected in each case, it is stored in a data matrix that contains a certain number of rows and columns. The
data is generally organized so that each row in the data matrix contains details about the case. Therefore, the rows
represent the case or the samples, while the columns represent the variable. The tabular format to present cases and
variables used in statistical study is known as a data matrix. A complete data matrix can contain thousands or even more
cases. Each cell contains a unique value for a particular variable (or observation).
254 Touchpad Artificial Intelligence (Ver. 2.0)-XI

