About this Study Set
This study set covers Statistics through
18 practice questions.
A collection of factual questions covering core statistical concepts, history, and measurements. Every question includes the correct answer so you can learn as you go — pick any format above to get started.
Questions & Answers
Browse all 18 questions from the
Fundamentals of Statistics study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
Which statistical measure represents the value that appears most frequently in a data set?
-
A
Mean
-
B
Median
-
C
Mode
-
D
Range
2
What is the term for the square root of the variance in a dataset?
-
A
Standard deviation
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B
Interquartile range
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C
Coefficient of variation
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D
Mean absolute deviation
3
In a perfectly symmetrical normal distribution, what is the relationship between the mean, median, and mode?
-
A
They are all different
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B
The mean is the highest
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C
The mode is the highest
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D
They are all equal
4
What does the 'p-value' in hypothesis testing represent?
-
A
The probability of the null hypothesis being true
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B
The size of the effect
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C
The probability of observing results as extreme as the data, assuming the null hypothesis is true
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D
The margin of error
5
Which term describes the difference between the maximum and minimum values in a dataset?
-
A
Variance
-
B
Interquartile range
-
C
Range
-
D
Standard deviation
6
What is a 'Type I error' in statistical hypothesis testing?
-
A
Failing to reject a false null hypothesis
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B
Rejecting a true null hypothesis
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C
Accepting an alternative hypothesis incorrectly
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D
The same as a Type II error
7
Who is often credited with the invention of the correlation coefficient, later refined by Karl Pearson?
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A
Francis Galton
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B
Ronald Fisher
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C
Thomas Bayes
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D
John Tukey
8
In descriptive statistics, what is the 'first quartile' (Q1) defined as?
-
A
The 10th percentile
-
B
The 25th percentile
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C
The 50th percentile
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D
The 75th percentile
9
Which type of data represents categories with no inherent mathematical order?
-
A
Ordinal data
-
B
Interval data
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C
Nominal data
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D
Ratio data
10
What is the sum of the deviations of a set of values from their mean always equal to?
-
A
The mean
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B
One
-
C
Zero
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D
The standard deviation
11
Which statistical chart uses a five-number summary (minimum, Q1, median, Q3, and maximum) to display data?
-
A
Histogram
-
B
Scatter plot
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C
Bar chart
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D
Box plot
12
What measure of central tendency is most sensitive to extreme outliers?
-
A
Mean
-
B
Median
-
C
Mode
-
D
Geometric mean
13
If a distribution is skewed to the right, which side has the longer tail?
-
A
The left side
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B
The right side
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C
Neither side
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D
The middle
14
What is the name of the theorem that states the distribution of sample means will be approximately normal, regardless of the population distribution, given a large enough sample size?
-
A
Law of Large Numbers
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B
Central Limit Theorem
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C
Bayes' Theorem
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D
Chebyshev's Inequality
15
In probability theory, what is the sum of the probabilities of all possible mutually exclusive outcomes in a sample space?
-
A
Zero
-
B
One
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C
The number of outcomes
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D
Infinity
16
What type of correlation indicates that as one variable increases, the other variable decreases?
-
A
Positive correlation
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B
Zero correlation
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C
Negative correlation
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D
Perfect correlation
17
Which measure of dispersion is calculated by taking the average of the squared deviations from the mean?
-
A
Standard deviation
-
B
Variance
-
C
Range
-
D
Interquartile range
18
What is the term for a subset of a population used to collect data in a study?
-
A
Parameter
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B
Census
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C
Sample
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D
Variable
