A
What is the primary purpose of statistics?
A) To confuse people
B) To collect, analyze, interpret, and present data
C) To make numbers look attractive
D) To prove any argument
B) To collect, analyze, interpret, and present data
A sample is a _______ of a population.
a) Subset
b) Duplicate
c) Larger portion
d) Full representation
a) Subset
Which measure of central tendency is most affected by extreme values?
A) Mean
B) Median
C) Mode
D) Range
A) Mean
What is the probability of an impossible event?
A) 0
B) 1
C) 0.5
D) Cannot be determined
Answer: A) 0
A pie chart is best used to show:
A) Trends over time
B) Distribution of categorical data
C) Relationship between variables
D) Differences in standard deviation
B) Distribution of categorical data
The median of the dataset {5, 7, 9, 12, 15} is:
a) 7
b) 9
c) 12
d) 10
b) 9
The average of a set of values is known as:
A) Median
B) Mode
C) Mean
D) Range
C) Mean
The middle value in an ordered dataset is called:
A) Mean
B) Median
C) Mode
D) Range
B) Median
The sum of all probabilities in a probability distribution must be:
a) Less than 1
b) More than 1
c) Equal to 1
d) Equal to 0
c) Equal to 1
The probability of a certain event happening is:
A) 0
B) 0.5
C) 1
D) -1
C) 1
Which of the following is a measure of central tendency?
A) Mean
B) Standard deviation
C) Variance
D) Range
A) Mean
A histogram is used to represent:
a) Categorical data
b) Numerical data
c) Both categorical and numerical data
d) None of the above
b) Numerical data
If all values in a dataset are the same, the standard deviation is:
A) 0
B) 1
C) Infinity
D) Cannot be determined
A) 0
What does a histogram represent?
A) Relationship between two variables
B) Frequency distribution of data
C) Differences between means
D) Probability of an event
B) Frequency distribution of data
In a normal distribution, the mean, median, and mode are:
a) Different
b) The same
c) Unrelated
d) Not measurable
b) The same
What does the standard deviation measure?
A) The average value
B) The spread of data
C) The most frequent value
D) The middle value
B) The spread of data
The most frequently occurring value in a dataset is called:
A) Mean
B) Median
C) Mode
D) Variance
C) Mode
Which statistical test is used to compare the means of two groups?
a) Correlation
b) T-test
c) Chi-square test
d) Regression
b) T-test
The average of squared differences from the mean is called:
a) Variance
b) Standard deviation
c) Mode
d) Range
a) Variance
Which of the following is NOT a measure of dispersion?
a) Standard deviation
b) Variance
c) Mode
d) Range
c) Mode
Which of the following represents a qualitative (categorical) variable?
a) Height of students
b) Age of employees
c) Eye color of people
d) Number of books in a library
c) Eye color of people
The probability of an impossible event is:
a) 0
b) 1
c) 0.5
d) Cannot be determined
a) 0
The difference between the highest and lowest values in a dataset is called:
A) Mean
B) Range
C) Standard deviation
D) Mode
B) Range
What type of graph is best suited for showing parts of a whole?
a) Bar graph
b) Line graph
c) Pie chart
d) Histogram
c) Pie chart
The shape of a normal distribution is:
a) Rectangular
b) Bell-shaped
c) Skewed
d) Triangular
b) Bell-shaped