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WorksheetsUCS551 REVISION
Total questions: 20
Worksheet time: 13mins
What is data analytics?
The study of ancient data
The process of extracting insights from data
A type of data storage format
A programming language
All of these are levels of measurement except:
Ratio Data
Interval Data
Ordinal Data
Nominal Data
Descriptive Data
Which of these are the type of data analytics?
Predictive analytics
Diagnostic analytics
Prescriptive analytics
Descriptive analytics
All of these
In the scenario where a retail company analyzes historical data to understand the causes behind a sudden decrease in product sales, which type of data analytics is being employed?
Predictive analytics
Descriptive analytics
Diagnostic analytics
Prescriptive analytics
In a dataset capturing information about customer purchases, including columns like "Customer ID," "Product Name," "Price," and an unexpected column labeled "Sensor Reading," you've realized that the "Sensor Reading" column doesn't provide relevant information for your analysis. What is the appropriate step to enhance the dataset?
Remove duplicate rows
Fill in missing values
Remove the "Sensor Reading" column
Standardize numerical values
Univariate Data is data set that consist of a _________ variable while Multivariate Data is data set that consist of a _________ variables.
single, multiple
multiple, single
single, categorical
time-series, categorical
What step needed because of incomplete, noisy, and inconsistent data are common place properties of large real world database and data warehouse.
Data Warehousing
Data Collecting
Data Preprocessing
Data Storage
In a retail corporation, the sales, inventory, and customer service departments maintain separate databases. To obtain a comprehensive view of customer interactions, what process is essential for combining these datasets?
Data normalization
Data cleansing
Data aggregation
Data integration
In the context of data analysis, what technique involves representing data graphically to identify patterns, trends, and insights more effectively?
Data normalization
Data visualization
Data integration
Data aggregation
What type of chart is shown ?
(a)
To classify labelled image of cats and dog we can use these algorithm except:
Decision Tree
K-NN
K-Means
Random Forest
This is a (a) Network architecture which is a classifier that mimic human brain.
What is algorithm use for clustering?
K-Means
K-NN
Logistic Regression
N-Means
What is the first method for K-Means?
Randomly choose k number of center point
Choose a number of cluster
Each data point classified by their distance to the center point
Recompute group center point by taking means of all the vectors in the group
When dealing with missing values in a dataset for a nominal variable (categorical data without inherent order), which approach is appropriate for replacement?
Use the mean of the available values
Use the mode of the available values
Use linear regression to predict missing values
Discard rows with missing values
In data analytics, what does the term "ETL" stand for?
Efficient Textual Language
Exception, Termination, Log
Elasticity, Tolerance, Loss
Extract, Transform, Load
Which type of data visualization is most suitable for representing the distribution of a single continuous variable, providing insights into the range, skewness, and potential outliers?
Bar chart
Scatter plot
Histogram
Pie chart
Why did the English teacher bring a ladder to class?
Because she wanted to improve their spelling.
Because she heard the class was going to a higher level.
Because she wanted to reach the students' high expectations.
Because she needed a better perspective on grammar.
Consider the following dataset representing the daily temperatures for the first six days of a week in a city:
If the temperature for the 7th day is missing, and you decide to replace it. What is the value to replace the 7th day temperature?
28.5
29.5
30.5
31.5
Consider the following dataset representing the weather conditions for the first six days of a week in a city:
If the weather condition for the 7th day is missing, and you decide to replace, which is the appropriate weather to replace it?
Sunny
Cloudy
Rainy
