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2. Name any 2 sources of structured data.
Ans. Online Forms and website logs
3. What is data?
Ans. Individual facts, statistics, or units of information, mostly numeric, that are gathered by observation are referred
to as data. Data are also referred to as a set of values for qualitative or quantitative variables about one or more
people or objects.
4. What do you mean by skewness?
Ans. Skewness is a measure of a distribution's symmetry. The mode of a distribution is its highest point. If the tail on one
side of the mode is fatter or longer than the tail on the other, the distribution is skewed, i.e., it is asymmetrical.
5. What are the two types of skewed distributions?
Ans. Left-skewed distribution: A negative skew in an asymmetrical distribution where the tail on the left side is longer
than the tail on the right is known as left-skewed distribution.
Right-skewed distribution: A positive skew where the tail on the right side is longer than the tail on the left is
known as right-skewed distribution.
6. Name the 3 types of peaks found in histograms.
Ans. Unimodal, Bimodal and Multimodal
7. What is a Box Plot?
Ans. A box plot is a form of chart that is frequently used in explanatory data analysis. It is also referred to as a box and
whisker plot.
8. Define Z-score.
Ans. A statistical measurement known as the Z-score indicates how closely a value relates to the mean of a group of
values
B. Long answer type questions.
1. Give 2 similarities and 2 differences between interval and ratio levels of measurement.
Ans. Similarities:
• Both interval and ratio scales represent the highest level of data measurement and help with a variety of
statistical insights that other types of data measurement scales do not support.
• Both show the order and the exact value between the units.
Differences:
Interval Ratio
Has no concept of an absolute zero, e.g, 0oC Has the concept of absolute zero, e.g, height.
does not mean an absence of temperature.
We can add and subtract the variables. The variables can be added, subtracted, multiplied, and
divided.
2. List any 3 advantages of pie charts.
Ans. Advantages of pie charts are:
• A simple and easy-to-understand graphic.
• It visually depicts facts as an element of a whole, which can be an effective communication tool for even an
inexperienced audience.
• It allows the audience to see a data comparison at a glance, allowing them to perform an immediate
analysis.
Data Analysis (Computational Thinking) 267

