MCQs

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Overall MCQs for Reference

Which of the following best summarizes the goal of descriptive statistics?
a. To make predictions based on data
b. To draw conclusions from a sample
c. To summarize and describe data characteristics
d. To test hypotheses
Answer: c. To summarize and describe data characteristicsscribbr
The statistical method used primarily to describe the characteristics of a dataset is:
a. Probability Distributions
b. Inferential Statistics
c. Neural Networks
d. Descriptive Statistics
Answer: d. Descriptive Statisticseasyexamnotes
Which is NOT a measure of central tendency?
a. Mean
b. Variance
c. Median
d. Mode
Answer: b. Varianceitfeature
What does the mean represent in a data set?
a. Most frequently occurring value
b. The middle value
c. The average value
d. The maximum value
Answer: c. The average valuegeeksforgeeks
In AI datasets, what would the median indicate?
a. The most common number
b. The smallest number
c. The central value when data is sorted
d. The sum of all values
Answer: c. The central value when data is sortedgeeksforgeeks
Which measure is most reliable when a dataset contains extreme outliers?
a. Mean
b. Median
c. Range
d. Variance
Answer: b. Medianscribbr
What is the mode in a set of data?
a. Largest value
b. Value that appears most often
c. Smallest value
d. Average of all values
Answer: b. Value that appears most oftengeeksforgeeks
The difference between the largest and smallest value in a dataset is known as:
a. Skewness
b. Range
c. Variance
d. Mean
Answer: b. Rangegeeksforgeeks
Which measure quantifies the spread of data from the mean?
a. Skewness
b. Variance
c. Mode
d. Median
Answer: b. Variancegeeksforgeeks
Standard deviation is best defined as:
a. The average of data values
b. The average difference from the mean
c. The squared mean
d. The maximum data value
Answer: b. The average difference from the meangeeksforgeeks
What does a low standard deviation indicate about a dataset?
a. Data points are spread out
b. Data values are inconsistent
c. Data points are close to the mean
d. The dataset is skewed
Answer: c. Data points are close to the meandatacamp
What is the primary use of descriptive statistics in AI?
a. Sampling data
b. Summarizing data
c. Building predictive models
d. Data encryption
Answer: b. Summarizing datascribbr
Which is a graphical representation of data distribution?
a. Histogram
b. Confusion matrix
c. Learning curve
d. Scatter table
Answer: a. Histogramstudocu
In descriptive statistics, which measure is NOT affected by extreme data values?
a. Mean
b. Range
c. Median
d. Standard deviation
Answer: c. Medianscribbr
If all the values in a dataset are the same, what is the standard deviation?
a. Maximum value
b. Zero
c. Median value
d. One
Answer: b. Zeroscribbr
The first step in a descriptive analysis of AI data is:
a. Data visualization
b. Data collection and summarization
c. Applying machine learning
d. Data encryption
Answer: b. Data collection and summarizationstudocu
Which statistic helps organize data and focuses on characteristics of data providing parameters?
a. Predictive statistics
b. Descriptive statistics
c. Sampling statistics
d. Computational statistics
Answer: b. Descriptive statisticsincludehelp
In descriptive statistics, the skewness of data helps to identify:
a. The average
b. The repetition of values
c. The symmetry of the distribution
d. The variance
Answer: c. The symmetry of the distributiondatacamp
What is the sum of squared deviations from the mean called?
a. Variance
b. Mode
c. Range
d. Central tendency
Answer: a. Varianceitfeature
The term for data already collected by someone else is:
a. Primary data
b. Biased data
c. Secondary data
d. Raw data
Answer: c. Secondary dataitfeature
Which is a measure of variability?
a. Mean
b. Mode
c. Standard deviation
d. Median
Answer: c. Standard deviationgeeksforgeeks
What is represented by the formula (Q3 – Q1)/2?
a. Mean deviation
b. Quartile deviation
c. Median split
d. Skewness
Answer: b. Quartile deviationgeeksforgeeks
Which central tendency measure is best for categorical data?
a. Mode
b. Median
c. Mean
d. Range
Answer: a. Modescribbr
The most appropriate measure for summarizing data with significant outliers is:
a. Mean
b. Mode
c. Median
d. Standard deviation
Answer: c. Medianscribbr
What is indicated by a normal distribution in a dataset?
a. Data is skewed right
b. Data is distributed equally around the mean
c. There are few unique values
d. The dataset only uses categorical variables
Answer: b. Data is distributed equally around the meandatacamp
What type of statistics describes the main features of a dataset through numerical summaries, visualizations, and tables?
a. Inferential
b. Descriptive
c. Predictive
d. Analytical
Answer: b. Descriptivescribbr
If the mean and median are equal in a dataset, what is likely to be true?
a. Data is highly skewed
b. Data distribution is normal
c. Data range is zero
d. All data values are the same
Answer: b. Data distribution is normalscribbr
What is meant by the term ‘central tendency’?
a. The spread of the data
b. The shape of distribution
c. The central or typical value of a dataset
d. The number of data points
Answer: c. The central or typical value of a datasetscribbr
Which tool is not commonly used in descriptive statistics?
a. Bar chart
b. Box plot
c. Hypothesis test
d. Pie chart
Answer: c. Hypothesis testscribbr
The best use for mode in AI descriptive statistics is for:
a. Continuous variables
b. Nominal scale data
c. Ratio scale data
d. Interval scale data
Answer: b. Nominal scale datascribbr
What does a positively skewed data distribution indicate?
a. Mean < Median
b. Mean > Median
c. Mean = Mode
d. Mean = 0
Answer: b. Mean > Mediandatacamp
Which descriptive statistic measures how flat or peaked a distribution is?
a. Variance
b. Kurtosis
c. Mode
d. Range
Answer: b. Kurtosisscribbr
Which of the following is calculated as sum of values divided by the count?
a. Mode
b. Median
c. Mean
d. Range
Answer: c. Meangeeksforgeeks
What represents the frequency of each value in a dataset?
a. Cumulative distribution
b. Frequency distribution
c. Box plot
d. Correlation
Answer: b. Frequency distributionstudocu
What will be the variance of a dataset if all data values are equal?
a. One
b. Maximum
c. Zero
d. Negative
Answer: c. Zeroscribbr
When data is displayed using intervals and frequencies, it is called:
a. Mode
b. Frequency distribution table
c. Standard deviation
d. Skewness table
Answer: b. Frequency distribution tablestudocu
What do lower and upper quartiles in data denote?
a. The maximum and minimum values
b. The data’s center
c. The 25th and 75th percentile values
d. The sum and difference
Answer: c. The 25th and 75th percentile valuesalmabetter
How do you calculate the mean of grouped data?
a. Sum of frequencies
b. Sum of mid-values divided by frequency
c. Mode
d. Product of mid-values
Answer: b. Sum of mid-values divided by frequencyitfeature
Which measure summarizes the average squared deviation from the mean?
a. Variance
b. Mode
c. Quartile deviation
d. Range
Answer: a. Variancegeeksforgeeks
Which characteristic best defines a histogram?
a. Dots representing data
b. Bars representing frequency intervals
c. Lines connecting points
d. Pie sections
Answer: b. Bars representing frequency intervalsstudocu
What is a box plot used for in descriptive statistics?
a. Show data distribution symmetry
b. Show the spread and identify outliers
c. Infer population parameters
d. Calculate mean
Answer: b. Show the spread and identify outliersscribbr
In descriptive statistics, the sum of squared deviations is minimized when taken from:
a. Median
b. Mode
c. Mean
d. Range
Answer: c. Meanitfeature
If the mean of 10 observations is 20, and all observations increase by 2, what is the new mean?
a. 20
b. 18
c. 22
d. 24
Answer: c. 22itfeature
What is the value most affected by extreme values?
a. Mean
b. Median
c. Mode
d. Quartile
Answer: a. Meanscribbr
The process of arranging data into rows and columns is called:
a. Sorting
b. Tabulation
c. Classification
d. Grouping
Answer: b. Tabulationstudocu
Measures of variability do NOT include:
a. Median
b. Range
c. Variance
d. Standard deviation
Answer: a. Medianscribbr
When all values occur with the same frequency, which should not be computed?
a. Mean
b. Mode
c. Median
d. Range
Answer: b. Modeitfeature
Which is NOT a type of descriptive statistics?
a. Measures of central tendency
b. Measures of variability
c. Sampling error tests
d. Frequency distributions
Answer: c. Sampling error testsscribbr
What is the sum of absolute deviations from the mean called?
a. Mean deviation
b. Median difference
c. Standard error
d. Quartile range
Answer: a. Mean deviationscribbr
In a perfectly symmetric distribution, which relationship holds true?
a. Mean > Median > Mode
b. Mean < Median < Mode
c. Mean = Median = Mode
d. Mean = 0 = Mode
Answer: c. Mean = Median = Modedatacamp

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