Computer Science Test - 16

The correct answer is option 1.

Concept:

Data come from different sources, they can be in different formats.

Structured Data:

Data that is organized and can be recorded in a well-defined format is called structured data. Structured data is often kept in a tabular (rows and columns) format on a computer, with each column representing distinct data for a specific parameter called an attribute, characteristic, or variable, and each row representing data from observation for several attributes.

Example:

Data related to an inventory of kitchen items maintained by a shop.

Unstructured Data:

Unstructured data is information that is not arranged according to a pre-set data model or schema, and therefore cannot be stored in a traditional relational database or RDBMS. Text and multimedia are two common types of unstructured content.

Example:

A newspaper contains a variety of news pieces, often known as data. However, a newspaper's placement of news pieces follows no set pattern. On any given day, a page may have three photos of various sizes, five news articles, and one or more adverts. On another day, one large image with three written news pieces may be displayed.

Hence the correct answer is Structured Data.

The correct answer is option 3.

Concept:

Data Storage:

Data storage is the process of storing data on storage devices so that data can be retrieved later. Large amounts of data are being created at an alarming rate these days. As a result, storing data has become a difficult undertaking. However, as the cost of digital storage devices has decreased, this work has become easier.

There are numerous digital storage devices available in the market like,

• Hard Disk Drive (HDD),
• Solid State Drive (SSD),
• CD/DVD,
• Tape Drive,
• Pen Drive,
• Memory Card, etc.

Hence the correct answer is Paper.

The correct answer is option 4.

Concept:

Range:

The range is the difference between the maximum and minimum values.

The range= Maximum value – Minimum value 

Mean:

Mean is simply the average of numeric values of an attribute. Mean is also called average.

Median:

The Median is also computed for a single attribute/variable at a time. When all the values are sorted in ascending or descending order, the middle value is called the Median.

Mode:

Mode is the value that appears the most frequently in the data of an attribute/variable.

• It is calculated using the frequency of distinct values occurring in the provided data.
• If each value appears just once in a data collection, it has no mode.
• If more than one number has the same peak frequency, the data may contain numerous modes.

The correct answer is Range.

The correct answer is option 3.

Concept:

Standard deviation:

Standard deviation is the positive square root of the average of squared difference of each value from the mean. It refers to differences within the group or set of data of a variable.

Given n values x1, x2, x3,...xn, and their mean x, the standard deviation, represented as σ (greek letter sigma) is computed as,

Formula:

Hence the correct answer is the standard deviation.

Additional Information

•  The range is the difference between the maximum and minimum values.
• The Median is the mid-value when data are sorted in ascending/descending order.
• The Mode is the data value that appears the most number of times.

The correct answer is option 4.

Concept:

Mean:

Mean is simply the average of numeric values of an attribute. Mean is also called average.

Definition:

Given n values x1, x2, x3,...xn, mean is computed as,

 Mean=

Explanation:

The given 10 values are, 70,150,110,115,85,90,100,110,110,100 and all students height are centi meters(cm)

Mean= (70+150+110+115+85+90+100+110+110+100)/10

Mean= 104 cm

Hence the correct answer is 104 cm.

The correct answer is option 1.

Concept:

Outlier:

An outlier is an exceptionally large or small value, in comparison to other values of the data. Usually, outliers are considered errors since they can influence/affect the average or other statistical calculations based on the data.

An outlier is a data point that varies considerably from other observations in statistics. Outliers can be caused by measurement variability or by experimental error; the latter is frequently eliminated from the data set. In statistical analysis, an outlier can generate major consequences.

Hence the correct answer is the outlier.

Additional InformationMean:

Mean is simply the average of numeric values of an attribute. Mean is also called average.

Median:

The Median is also computed for a single attribute/variable at a time. When all the values are sorted in ascending or descending order, the middle value is called the Median.

Mode:

Mode is the value that appears the most frequently in the data of an attribute/variable.

• It is calculated using the frequency of distinct values occurring in the provided data.
• If each value appears just once in a data collection, it has no mode.
• If more than one number has the same peak frequency, the data may contain numerous modes.

The correct answer is option 4.

Concept:

Statement 1: Metadata is basically data about data.

True, In simple terms, metadata is “data/information about data".

• Metadata helps us understand the structure, nature, and context of the data.
• Metadata facilitates easy search and retrieval of data.
• Metadata also helps keep a check on the quality and reliability of data. Metadata is the key to unlocking the value of your data.

Statement 2: Structured data is usually stored in computer in a tabular format which consists of rows and columns.

True, Structured data is stored in tabular formats like excel sheets or SQL databases. Structured data has a pre-defined data model. Unstructured data does not have a pre-defined data model.

Hence the correct answer is None of the above.

The correct answer is option 2.

Concept:

Data come from different sources, they can be in different formats.
Structured Data:
Data that is organized and can be recorded in a well-defined format is called structured data. Structured data is often kept in a tabular (rows and columns) format on a computer, with each column representing distinct data for a specific parameter called an attribute, characteristic, or variable, and each row representing data from observation for several attributes.
Unstructured Data:
Unstructured data is information that is not arranged according to a pre-set data model or schema, and therefore cannot be stored in a traditional relational database or RDBMS. Text and multimedia are two common types of unstructured content.

Explanation:

Images and video recordings are commonly categorized as unstructured data, which means that they are not primarily suited for computer analysis. The contents of unstructured data cannot be adequately represented by numbers or symbols and require the power of human vision for extracting meaningful information.

Hence the correct answer is Unstructured data.

The correct answer is option 1.

Concept:

Range:

The range is the difference between the maximum and minimum values.

The range of that students= 34-27 =7

Standard deviation:

Standard deviation is the positive square root of the average of squared difference of each value from the mean. It refers to differences within the group or set of data of a variable.

Given n values x1, x2, x3,...xn, and their mean x, the standard deviation, represented as σ (greek letter sigma) is computed as,

Formula:

Standard deviation:

Standard deviation= \(\sqrt{76.858 \over 7} \space= 3.313\)

Hence the correct answer is a-3.313, b-7

Alternate Method We know the range answer is 7 then we don't need to calculate the Standard deviation. we can directly mark the answer. Hence option 1 is correct.

The correct answer is option 3.

Concept:

Statement 1: Raw data is data that has not been processed for use. It is in the form of numbers / Text / Images.

True, Raw data, also known as primary data, is data collected from a source. Raw data is data that has not been processed for use. It is in the form of numbers / Text / Images.

Statement 2: Information is processed, organized, and structured data. It is in the form of a table or chart or text.

True, Information that has been processed, organized and structured. It puts facts into perspective and facilitates decision-making.  It is in the form of a table or chart or text.

Example:

A single customer’s sale at a restaurant is data – this becomes information when the business is able to identify the most popular or least popular dish.

Hence the correct answer is Both statement 1 and statement 2 are true.