MCQs

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Overall MCQs for Reference

Who is considered more skilled at statistics than any programmer and more skilled at programming than any statistician?
a. Programmer
b. Data Analyst
c. Data Scientist
d. Statistician
Answer: c. Data Scientistincludehelp
What is the foundation of all machine learning algorithms?
a. Statistics only
b. Programming only
c. Both Mathematics and Statistics
d. Algorithms
Answer: c. Both Mathematics and Statisticsincludehelp
Which category does statistics fall under primarily?
a. Social Science
b. Mathematical Science
c. Biological Science
d. Engineering Science
Answer: b. Mathematical Scienceincludehelp
How many types of statistical analysis can be performed on events?
a. One
b. Two
c. Three
d. Four
Answer: b. Twoincludehelp
Statistics are divided into how many main categories?
a. 2
b. 3
c. 4
d. 5
Answer: a. 2includehelp
Which type of statistics helps organize data and provide data characteristics?
a. Inferential Statistics
b. Descriptive Statistics
c. Sampling Statistics
d. Bayesian Statistics
Answer: b. Descriptive Statisticsincludehelp
What are the main measures of central tendency?
a. Mean and Variance
b. Variance and Median
c. Mean, Median, and Mode
d. Median and Mode
Answer: c. Mean, Median, and Modeincludehelp
What is the range in a dataset?
a. Difference between mean and median
b. Difference between the highest and lowest values
c. Difference between median and mode
d. Sum of all values
Answer: b. Difference between the highest and lowest valuesincludehelp
Which measure indicates the spread of a dataset?
a. Mean
b. Standard Deviation
c. Mode
d. Median
Answer: b. Standard Deviationsanfoundry+1
Which category uses probability to generalize results to a larger population?
a. Descriptive Statistics
b. Machine Learning
c. Inferential Statistics
d. Bayesian Analytics
Answer: c. Inferential Statisticsinterviewkickstart
What is the value called that appears most frequently in a dataset?
a. Mean
b. Median
c. Mode
d. Frequency
Answer: c. Modeincludehelp
If the mean is greater than the median, what is likely the shape of the distribution?
a. Skewed right
b. Skewed left
c. Symmetric
d. Bimodal
Answer: a. Skewed rightgeeksforgeeks
What percentage of values fall within one standard deviation in a normal distribution?
a. 34%
b. 68%
c. 95%
d. 99.7%
Answer: b. 68%geeksforgeeks
Which statistical method is used to predict relationships between variables?
a. Clustering
b. Regression
c. Association Rules
d. Classification
Answer: b. Regressionscribd
What does the correlation coefficient (r) measure?
a. The strength and direction of a linear relationship
b. The average of the datasets
c. The spread of the dataset
d. The variance explained by independent variable
Answer: a. The strength and direction of a linear relationshipgeeksforgeeks
Central tendency can be measured by:
a. Mean
b. Median
c. Mode
d. All of the above
Answer: d. All of the aboveincludehelp
Which is not a graphical method for data representation?
a. Histogram
b. Bar Chart
c. Scatter Plot
d. Regression Table
Answer: d. Regression Tableincludehelp
The variance of a sample is denoted as:
a. s
b. s²
c. σ
d. σ²
Answer: b. s²includehelp
What is the main purpose of sampling in statistics?
a. To record every observation
b. To reduce population to zero
c. To make inferences about a population
d. To increase dataset size
Answer: c. To make inferences about a populationtestbook
Which statistical test compares the means of two independent groups?
a. t-test
b. ANOVA
c. Chi-square Test
d. Pearson Correlation
Answer: a. t-testtestbook
Which is a non-parametric measure of correlation?
a. Pearson’s r
b. Standard Deviation
c. Spearman’s Rank
d. Regression Coefficient
Answer: c. Spearman’s Rankgyansetu
What is the term for extreme values in data?
a. Percentile
b. Quartiles
c. Outlier
d. Cluster
Answer: c. Outlierscribd
What type of sampling involves dividing the population into groups and then randomly sampling each group?
a. Simple Random
b. Systematic
c. Stratified
d. Cluster
Answer: c. Stratifiedtestbook
The likelihood of an event’s occurrence is known as:
a. Certainty
b. Frequency
c. Probability
d. Distribution
Answer: c. Probabilityplacementpreparation+1
Which is NOT a measure of dispersion?
a. Variance
b. Mean
c. Interquartile Range
d. Standard Deviation
Answer: b. Meanincludehelp
In hypothesis testing, what is the threshold for rejecting the null hypothesis called?
a. Test statistic
b. p-value
c. Confidence Interval
d. Significance level
Answer: d. Significance levelitfeature
What is the purpose of exploratory data analysis (EDA)?
a. Final modeling
b. Data cleaning
c. To summarize main characteristics
d. Parameter tuning
Answer: c. To summarize main characteristicsgyansetu
Which of the following is a categorical variable?
a. Age
b. Weight
c. Blood Group
d. Temperature
Answer: c. Blood Grouptestbook
Which plot best visualizes the distribution of a numeric feature?
a. Histogram
b. Pie chart
c. Box plot
d. Line chart
Answer: a. Histogramincludehelp
Standard deviation is always:
a. Equal to variance
b. Positive
c. Negative
d. Zero
Answer: b. Positivegyansetu
What method is commonly used for handling missing data in datasets?
a. Removal
b. Mean/Median Imputation
c. Random sampling
d. Both a and b
Answer: d. Both a and binterviewbit
What does hypothesis testing assess?
a. Sample variability
b. Statistical evidence to support/refute a hypothesis
c. Data size
d. Central tendency
Answer: b. Statistical evidence to support/refute a hypothesisincludehelp
Which method is best for determining causation between two variables?
a. Correlation
b. Regression
c. Experimental study
d. Descriptive statistics
Answer: c. Experimental studyitfeature
In statistics, what is the median?
a. Average value
b. Middle value when sorted
c. Most frequent value
d. Smallest value
Answer: b. Middle value when sortedincludehelp
Which type of variable can take infinite values?
a. Discrete
b. Categorical
c. Continuous
d. Ordinal
Answer: c. Continuousincludehelp
What is the first step in statistical analysis?
a. Data Collection
b. Data Visualization
c. Data Cleaning
d. Model Selection
Answer: a. Data Collectionincludehelp
Which is NOT a type of probability distribution?
a. Normal
b. Binomial
c. Poisson
d. Categorical
Answer: d. Categoricalincludehelp
A confidence interval is:
a. Point estimate
b. Range of plausible values
c. Average of dataset
d. Outlier identification
Answer: b. Range of plausible valuesincludehelp
Which sampling method gives every member an equal chance of selection?
a. Systematic
b. Stratified
c. Cluster
d. Simple Random
Answer: d. Simple Randomtestbook
What does ANOVA stand for?
a. Analysis of Variance
b. Analysis of Averages
c. Algorithm of Variables
d. Accuracy of Values
Answer: a. Analysis of Variancetestbook
In statistics, what does the p-value help to determine?
a. Central tendency
b. Statistical significance
c. Outlier detection
d. Data visualization
Answer: b. Statistical significanceitfeature
Which chart is best for categorical data visualization?
a. Bar chart
b. Histogram
c. Scatter plot
d. Line chart
Answer: a. Bar chartincludehelp
Which of the following is a right-skewed distribution?
a. Mode < Median < Mean
b. Mean < Median < Mode
c. Mean = Median = Mode
d. None of the above
Answer: a. Mode < Median < Meangeeksforgeeks
What is the main purpose of inferential statistics?
a. Describe population
b. Draw conclusions about population from sample
c. Calculate mode
d. Find outliers
Answer: b. Draw conclusions about population from sampleincludehelp
What do principal component analysis (PCA) techniques do?
a. Predict target variable
b. Reduce dimensionality
c. Classify data
d. Detect outliers
Answer: b. Reduce dimensionalityinterviewbit
What is a box plot primarily used for?
a. Showing average only
b. Summarizing spread, central value, and outliers
c. Comparing two means
d. Data cleaning
Answer: b. Summarizing spread, central value, and outliersincludehelp
Which of the following is an example of a nominal variable?
a. Temperature
b. Age
c. Gender
d. Weight
Answer: c. Gendertestbook
What kind of variable is “Rank in class”?
a. Nominal
b. Ordinal
c. Interval
d. Ratio
Answer: b. Ordinaltestbook
Which type of error occurs when a true null hypothesis is rejected?
a. Type I
b. Type II
c. Type III
d. Type IV
Answer: a. Type Iitfeature
What percentage of data falls within 3 standard deviations in a normal distribution?
a. 68%
b. 95%
c. 99.7%
d. 100%
Answer: c. 99.7%geeksforgeeks

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