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D467 - Exploring Data Questions and Answers Already Passed What type of chart is commonly used to visualize the distribution of a numerical variable? a. Bar chart b. Histogram c. Pie chart d. Line graph Which of the following is a method for detecting outliers in a dataset? a. Mea...

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  • September 29, 2024
  • 61
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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D467 - Exploring Data Questions and
Answers Already Passed
What type of chart is commonly used to visualize the distribution of a numerical variable?

a. Bar chart


✔✔b. Histogram


c. Pie chart

d. Line graph




Which of the following is a method for detecting outliers in a dataset?

a. Mean


✔✔b. Box plot


c. Mode

d. Range




What does the term "data cleaning" refer to?

a. Storing data securely

b. Removing duplicates from a dataset


✔✔c. Correcting or removing inaccurate records

1

,d. Formatting data for presentation




What type of analysis focuses on the relationships between multiple variables?


✔✔a. Multivariate analysis


b. Univariate analysis

c. Bivariate analysis

d. Descriptive analysis




What is a key feature of a scatter plot?

a. It shows the frequency of categorical data

b. It displays data trends over time


✔✔c. It represents the relationship between two quantitative variables


d. It summarizes the central tendency of a dataset




Which statistical measure represents the average value of a dataset?


✔✔a. Mean


b. Median

c. Mode


2

,d. Range




What does a correlation coefficient indicate?

a. The size of the dataset


✔✔b. The strength and direction of a linear relationship between two variables


c. The central tendency of data

d. The number of outliers in a dataset




Which of the following is an example of qualitative data?

a. Age of respondents


✔✔b. Eye color of participants


c. Height measurements

d. Sales figures




What is the purpose of data visualization in exploratory analysis?

a. To create data models


✔✔b. To present data in a way that highlights patterns and insights


c. To clean the dataset


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, d. To calculate statistics




What is the significance of a box plot?


✔✔a. It shows the distribution of data based on five summary statistics


b. It compares means across groups

c. It visualizes time-series data

d. It displays correlation coefficients




How can you assess the normality of a dataset?

a. By calculating the median


✔✔b. By using a Q-Q plot or Shapiro-Wilk test


c. By calculating the mean

d. By creating a histogram only




What role does data aggregation play in exploratory data analysis?

a. It visualizes raw data points


✔✔b. It summarizes data to identify trends and patterns


c. It cleans the data


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