ASA 115 Practice Exam Questions With
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. What is the primary purpose of statistics?
A. To collect only numerical data
B. To interpret and make decisions based on data
C. To eliminate uncertainty completely
D. To avoid using samples
Answer: B. To interpret and make decisions based on data
Rationale: Statistics focuses on collecting, analyzing, interpreting, and
making informed decisions using data rather than eliminating
uncertainty entirely.
2. Which of the following is a qualitative variable?
A. Height
B. Weight
C. Gender
D. Age
Answer: C. Gender
Rationale: Qualitative variables describe categories or labels, not
numerical measurements.
,3. The mean of a dataset is also known as the:
A. Middle value
B. Most frequent value
C. Average
D. Range
Answer: C. Average
Rationale: The mean is calculated by adding all values and dividing by
the number of observations.
4. Which measure is most affected by extreme values?
A. Median
B. Mode
C. Mean
D. Range
Answer: C. Mean
Rationale: Extreme values (outliers) significantly influence the mean
more than other measures of central tendency.
5. The median is best described as the:
A. Most common value
B. Middle value in an ordered dataset
C. Sum of all values
D. Difference between max and min
,Answer: B. Middle value in an ordered dataset
Rationale: The median divides a dataset into two equal halves when
ordered.
6. The mode is the:
A. Average value
B. Middle value
C. Most frequently occurring value
D. Largest value
Answer: C. Most frequently occurring value
Rationale: The mode identifies the value that appears most often in a
dataset.
7. Which of the following is a measure of dispersion?
A. Mean
B. Median
C. Variance
D. Mode
Answer: C. Variance
Rationale: Variance measures how far data values spread from the
mean.
8. The square root of variance is called:
A. Range
B. Standard deviation
, C. Mean deviation
D. Median
Answer: B. Standard deviation
Rationale: Standard deviation gives dispersion in the same units as
the data.
9. A population is defined as:
A. A subset of data
B. A sample taken randomly
C. Entire group of interest
D. Only numerical data
Answer: C. Entire group of interest
Rationale: A population includes all individuals or items being studied.
10. A sample is:
A. Entire population
B. A subset of the population
C. Only qualitative data
D. A fixed constant
Answer: B. A subset of the population
Rationale: A sample represents part of a population used for analysis.
11. Which scale of measurement has a true zero point?
A. Nominal
B. Ordinal
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of statistics?
A. To collect only numerical data
B. To interpret and make decisions based on data
C. To eliminate uncertainty completely
D. To avoid using samples
Answer: B. To interpret and make decisions based on data
Rationale: Statistics focuses on collecting, analyzing, interpreting, and
making informed decisions using data rather than eliminating
uncertainty entirely.
2. Which of the following is a qualitative variable?
A. Height
B. Weight
C. Gender
D. Age
Answer: C. Gender
Rationale: Qualitative variables describe categories or labels, not
numerical measurements.
,3. The mean of a dataset is also known as the:
A. Middle value
B. Most frequent value
C. Average
D. Range
Answer: C. Average
Rationale: The mean is calculated by adding all values and dividing by
the number of observations.
4. Which measure is most affected by extreme values?
A. Median
B. Mode
C. Mean
D. Range
Answer: C. Mean
Rationale: Extreme values (outliers) significantly influence the mean
more than other measures of central tendency.
5. The median is best described as the:
A. Most common value
B. Middle value in an ordered dataset
C. Sum of all values
D. Difference between max and min
,Answer: B. Middle value in an ordered dataset
Rationale: The median divides a dataset into two equal halves when
ordered.
6. The mode is the:
A. Average value
B. Middle value
C. Most frequently occurring value
D. Largest value
Answer: C. Most frequently occurring value
Rationale: The mode identifies the value that appears most often in a
dataset.
7. Which of the following is a measure of dispersion?
A. Mean
B. Median
C. Variance
D. Mode
Answer: C. Variance
Rationale: Variance measures how far data values spread from the
mean.
8. The square root of variance is called:
A. Range
B. Standard deviation
, C. Mean deviation
D. Median
Answer: B. Standard deviation
Rationale: Standard deviation gives dispersion in the same units as
the data.
9. A population is defined as:
A. A subset of data
B. A sample taken randomly
C. Entire group of interest
D. Only numerical data
Answer: C. Entire group of interest
Rationale: A population includes all individuals or items being studied.
10. A sample is:
A. Entire population
B. A subset of the population
C. Only qualitative data
D. A fixed constant
Answer: B. A subset of the population
Rationale: A sample represents part of a population used for analysis.
11. Which scale of measurement has a true zero point?
A. Nominal
B. Ordinal
