#1
What is the primary purpose of descriptive statistics?
To summarize and describe key features of a dataset
ExplanationSummarize dataset features.
#2
Which measure of central tendency is most affected by outliers?
Mean
ExplanationMost affected by outliers.
#3
In data analysis, what is the purpose of a pie chart?
To show the percentage distribution of categories in a whole
ExplanationDisplays percentage distribution of categories.
#4
Which of the following charts is suitable for displaying the distribution of a continuous variable?
Histogram
ExplanationDisplays continuous variable distribution.
#5
In statistical hypothesis testing, what does the p-value represent?
The probability of observing the data, assuming the null hypothesis is true
ExplanationProbability of observing data given null hypothesis.
#6
What is the purpose of a scatter plot in data analysis?
To show the relationship between two continuous variables
ExplanationDisplays relationship between continuous variables.
#7
In statistical terms, what does the term 'confidence interval' represent?
The range of values within which the true population parameter is likely to fall
ExplanationRange where true parameter likely falls.
#8
What is the purpose of data normalization in statistical analysis?
To transform the data to have a mean of zero and standard deviation of one
ExplanationTransforms data to mean 0, std deviation 1.
#9
What is the purpose of a box plot (box-and-whisker plot) in data visualization?
To display the spread and skewness of a dataset
ExplanationShows dataset spread and skewness.
#10
What is the difference between correlation and causation in statistics?
Correlation measures the strength of a relationship, while causation implies a cause-and-effect link
ExplanationCorrelation vs. cause-and-effect link.
#11
What is the purpose of a Q-Q plot in statistics?
To test the normality of a dataset
ExplanationTests dataset normality.
#12
When is it appropriate to use a t-test in hypothesis testing?
When comparing the means of two independent groups
ExplanationCompare means of independent groups.
#13
What is the purpose of a dendrogram in hierarchical clustering?
To show the hierarchy of clusters and their similarity
ExplanationShows cluster hierarchy and similarity.