1. What does the interquartile range (IQR) measure in a dataset?
A. The difference between the maximum and minimum values
B. The range of the middle 50% of the data
C. The average value of the dataset
D. The spread of all values in the dataset
Answer: B) The range of the middle 50% of the data
Rationale: The interquartile range (IQR) measures the spread of the
middle 50% of the data by calculating the difference between the first
and third quartiles.
2. What is a key difference between a population and a sample?
A. A population includes all members of a group, while a sample is a
subset of that group.
B. A sample includes all members of a group, while a population is a
subset.
C. A population is always smaller than a sample.
D. A sample is always more accurate than a population.
Answer: A) A population includes all members of a group, while a
sample is a subset of that group.
Rationale: A population is the entire group being studied, whereas a
sample is a smaller, representative subset of that group.
,3. Which of the following is an example of a time-series data?
A. The number of students in different age groups
B. Daily stock prices over a month
C. The types of animals in a zoo
D. Survey responses from different countries
Answer: B) Daily stock prices over a month
Rationale: Time-series data is collected over time, typically at
consistent intervals, such as daily stock prices or monthly temperature
measurements.
4. Which of the following is a characteristic of qualitative data?
A. It can be measured and expressed numerically.
B. It represents categories or labels.
C. It is always continuous.
D. It has a defined order or ranking.
Answer: B) It represents categories or labels.
Rationale: Qualitative data refers to non-numeric data that represents
categories or labels, such as names, colors, or types.
5. Which of the following is the primary use of a chi-square test?
A. To test for significant differences in means between two groups
, B. To test the relationship between two categorical variables
C. To predict future values based on past trends
D. To compare the variances of two datasets
Answer: B) To test the relationship between two categorical variables
Rationale: The chi-square test is used to examine the association
between two categorical variables to determine if they are independent
or related.
6. Which of the following graphs is most suitable for showing trends
over time?
A. Histogram
B. Line chart
C. Pie chart
D. Box plot
Answer: B) Line chart
Rationale: Line charts are ideal for visualizing data trends over time,
especially when the data points are continuous.
7. Which of the following describes a positively skewed distribution?
A. Most data points are concentrated on the right side of the mean.
B. The mean is greater than the median.
C. Data points are symmetrically distributed around the mean.
D. The data are equally distributed across all values.
A. The difference between the maximum and minimum values
B. The range of the middle 50% of the data
C. The average value of the dataset
D. The spread of all values in the dataset
Answer: B) The range of the middle 50% of the data
Rationale: The interquartile range (IQR) measures the spread of the
middle 50% of the data by calculating the difference between the first
and third quartiles.
2. What is a key difference between a population and a sample?
A. A population includes all members of a group, while a sample is a
subset of that group.
B. A sample includes all members of a group, while a population is a
subset.
C. A population is always smaller than a sample.
D. A sample is always more accurate than a population.
Answer: A) A population includes all members of a group, while a
sample is a subset of that group.
Rationale: A population is the entire group being studied, whereas a
sample is a smaller, representative subset of that group.
,3. Which of the following is an example of a time-series data?
A. The number of students in different age groups
B. Daily stock prices over a month
C. The types of animals in a zoo
D. Survey responses from different countries
Answer: B) Daily stock prices over a month
Rationale: Time-series data is collected over time, typically at
consistent intervals, such as daily stock prices or monthly temperature
measurements.
4. Which of the following is a characteristic of qualitative data?
A. It can be measured and expressed numerically.
B. It represents categories or labels.
C. It is always continuous.
D. It has a defined order or ranking.
Answer: B) It represents categories or labels.
Rationale: Qualitative data refers to non-numeric data that represents
categories or labels, such as names, colors, or types.
5. Which of the following is the primary use of a chi-square test?
A. To test for significant differences in means between two groups
, B. To test the relationship between two categorical variables
C. To predict future values based on past trends
D. To compare the variances of two datasets
Answer: B) To test the relationship between two categorical variables
Rationale: The chi-square test is used to examine the association
between two categorical variables to determine if they are independent
or related.
6. Which of the following graphs is most suitable for showing trends
over time?
A. Histogram
B. Line chart
C. Pie chart
D. Box plot
Answer: B) Line chart
Rationale: Line charts are ideal for visualizing data trends over time,
especially when the data points are continuous.
7. Which of the following describes a positively skewed distribution?
A. Most data points are concentrated on the right side of the mean.
B. The mean is greater than the median.
C. Data points are symmetrically distributed around the mean.
D. The data are equally distributed across all values.
