DCA6112 DATA VISUALIZATION

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Description

SESSION NOV 2024
PROGRAM MASTER OF COMPUTER APPLICATION (MCA)
SEMESTER 1
COURSE CODE & NAME DCA6112 DATA VISUALIZATION
   
   

 

 

Set-I

 

  1. A manufacturing company wants to monitor the quality of its products by analyzing defect rates. Discuss how you would use Excel to create Box and Whisker Plots to identify outliers and variability in defect rates. The company also wants to implement a Gantt Chart to manage production schedules. Explain how to create and interpret this chart in Excel for effective project management.

Ans 1.

Using Excel for Box and Whisker Plots and Gantt Charts

A Box and Whisker Plot, also known as a box plot, is an essential statistical tool for analyzing data distribution and identifying outliers. A manufacturing company can leverage this feature in Excel to monitor defect rates, ensuring product quality. The plot visualizes key data points, such as the minimum, first quartile (Q1), median, third quartile (Q3), and maximum values. The “box” represents the interquartile range (IQR), capturing 50% of the data points, while the “whiskers” extend to show variability outside the IQR.

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  1. Describe the steps to create a pie chart in Excel, and discuss when it is most appropriate to use this chart type. Explain how to create a bar chart in Excel and give an example of a scenario where a bar chart is the most effective.

Ans 2.

Creating and Using Pie and Bar Charts in Excel

Pie Chart Creation and Usage

A Pie Chart is an intuitive way to represent data as proportional segments of a whole. It is most effective when the goal is to show relative percentages or contributions of categories, such as revenue by product line or market share distribution.

To create a Pie Chart in

 

  1. A retail store wants to analyze the sales performance of different product categories over the past year. Using Excel, recommend suitable chart types to visualize this data and justify your choices. The sales manager wants to highlight seasonal trends in product sales. Design a visualization strategy using Excel to present these trends and explain your approach.

Ans 3.

Recommended Chart Types for Sales Performance Analysis

To analyze the sales performance of different product categories over the past year, suitable chart types in Excel include Clustered Column Charts and Stacked Column Charts. These charts effectively compare sales values across categories and time periods, offering a clear visual representation of performance differences.

A Clustered Column Chart is ideal for

 

Set-II

 

  1. A company has collected customer feedback in text format. Discuss how you would use Python to generate a Word Cloud and frequency distribution to analyze common themes in the feedback. Propose a method for cleaning and preparing this text data before visualization, explaining the steps you would take to ensure the data is ready for analysis.

 

Ans 4.

Using Python for Word Clouds and Frequency Distribution

A Word Cloud is a powerful visualization tool for analyzing textual feedback by highlighting frequently used words. To generate a Word Cloud using Python:

  1. Import necessary libraries like wordcloud

 

  1. Discuss techniques for dealing with missing data in Python and explain why data cleaning is crucial for accurate visualizations.

Explain how data transformation and applying filters can enhance data visualization in Python.

Ans 5.

Dealing with Missing Data in Python and Its Importance for Accurate Visualizations

Techniques for Handling Missing Data

Missing data is a common issue in datasets and can significantly impact the quality of analysis and visualizations. Python provides several techniques to handle missing data effectively:

  1. Removing Missing Values: In cases where the amount of missing data is minimal, rows or columns with missing values can be removed using methods like dropna() from the pandas library. However, this approach should be used cautiously to avoid losing significant portions of dat
  1. An e-commerce platform wants to visualize sales performance across different regions of the country. Explain how you would use Excel to create a Heat Map and discuss what insights this visualization might reveal. The company also wants to use Python for a more dynamic visualization. Suggest a suitable Python library for this task and explain the advantages of using Python over Excel for this type of analysis.

Ans 6.

Enhancing Data Visualization Through Transformation and Filtering

Data Transformation improves visualization by preparing the data in a form suitable for analysis. Transformation techniques include:

  1. Normalization and Scaling: