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STA 2023 Practice Test Exam | 400
Multiple Choice Q&A with Rationales |
Complete Review for UF, FSU, UCF, USF,
& FAU
Ace your STA 2023 final exam with this complete practice test featuring 400 multiple-
choice questions, bolded correct answers, and detailed rationales. Covers descriptive
statistics, probability, confidence intervals, hypothesis testing, regression, ANOVA, chi-
square, and nonparametric tests. Perfect for University of Florida, FSU, UCF, USF, and
FAU students. Includes exam-style questions organized by topic for efficient study.
Instant digital download. Master STA 2023 today
1. Which of the following is a continuous random variable?
A) Number of students in a class
B) Number of defective light bulbs
C) Temperature in degrees Fahrenheit
D) Number of siblings
Rationale: Temperature can take any value within an interval (e.g., 72.5°), making it
continuous; the others are counts.
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2. A sample has mean 50 and standard deviation 10. What is the
z-score for x = 70?
A) 0.5
B) 1.0
C) *2.0*
D) 7.0
Rationale: z = (70-50)/10 = 2.0, meaning 70 is two standard deviations above the
mean.
3. Which measure is most affected by outliers?
A) Median
B) Mean
C) Mode
D) Interquartile range
Rationale: The mean uses all values and shifts greatly with extreme scores; the median
is robust.
4. For a skewed right distribution, the relationship between
mean and median is:
A) Mean < Median
B) Mean > Median
C) Mean = Median
D) Cannot determine
Rationale: In right-skewed data, the tail pulls the mean upward, so mean > median.
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5. The probability of an event that is certain to occur is:
A) 0
B) 0.5
C) *1*
D) Depends on the sample space
Rationale: By definition, a certain event has probability 1.
6. Two events are mutually exclusive if:
A) They are independent
B) They cannot occur at the same time
C) They have the same probability
D) One implies the other
Rationale: Mutually exclusive means P(A∩B) = 0.
7. If P(A) = 0.4 and P(B) = 0.5 with A and B independent, then
P(A∩B) =
A) 0.1
B) *0.2*
C) 0.9
D) 0.0
Rationale: For independent events, P(A∩B) = P(A)·P(B) = 0.4×0.5 = 0.2.
8. A fair die is rolled. What is P(odd number)?
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A) 1/6
B) 1/3
C) *1/2*
D) 2/3
Rationale: Odd outcomes {1,3,5} give 3/6 = 1/2.
9. In a standard deck, what is P(drawing a King)?
A) 1/13
B) *4/52 = 1/13*
C) 1/4
D) 13/52
Rationale: 4 Kings out of 52 cards = 4/52 = 1/13.
10. Which is a parameter?
A) Sample mean
B) Sample standard deviation
C) Population mean
D) Sample proportion
Rationale: A parameter describes a population; sample statistics describe samples.
11. The standard deviation of the sampling distribution of the
sample mean is called the:
A) Variance
B) Standard error
STA 2023 Practice Test Exam | 400
Multiple Choice Q&A with Rationales |
Complete Review for UF, FSU, UCF, USF,
& FAU
Ace your STA 2023 final exam with this complete practice test featuring 400 multiple-
choice questions, bolded correct answers, and detailed rationales. Covers descriptive
statistics, probability, confidence intervals, hypothesis testing, regression, ANOVA, chi-
square, and nonparametric tests. Perfect for University of Florida, FSU, UCF, USF, and
FAU students. Includes exam-style questions organized by topic for efficient study.
Instant digital download. Master STA 2023 today
1. Which of the following is a continuous random variable?
A) Number of students in a class
B) Number of defective light bulbs
C) Temperature in degrees Fahrenheit
D) Number of siblings
Rationale: Temperature can take any value within an interval (e.g., 72.5°), making it
continuous; the others are counts.
,2|Page
2. A sample has mean 50 and standard deviation 10. What is the
z-score for x = 70?
A) 0.5
B) 1.0
C) *2.0*
D) 7.0
Rationale: z = (70-50)/10 = 2.0, meaning 70 is two standard deviations above the
mean.
3. Which measure is most affected by outliers?
A) Median
B) Mean
C) Mode
D) Interquartile range
Rationale: The mean uses all values and shifts greatly with extreme scores; the median
is robust.
4. For a skewed right distribution, the relationship between
mean and median is:
A) Mean < Median
B) Mean > Median
C) Mean = Median
D) Cannot determine
Rationale: In right-skewed data, the tail pulls the mean upward, so mean > median.
,3|Page
5. The probability of an event that is certain to occur is:
A) 0
B) 0.5
C) *1*
D) Depends on the sample space
Rationale: By definition, a certain event has probability 1.
6. Two events are mutually exclusive if:
A) They are independent
B) They cannot occur at the same time
C) They have the same probability
D) One implies the other
Rationale: Mutually exclusive means P(A∩B) = 0.
7. If P(A) = 0.4 and P(B) = 0.5 with A and B independent, then
P(A∩B) =
A) 0.1
B) *0.2*
C) 0.9
D) 0.0
Rationale: For independent events, P(A∩B) = P(A)·P(B) = 0.4×0.5 = 0.2.
8. A fair die is rolled. What is P(odd number)?
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A) 1/6
B) 1/3
C) *1/2*
D) 2/3
Rationale: Odd outcomes {1,3,5} give 3/6 = 1/2.
9. In a standard deck, what is P(drawing a King)?
A) 1/13
B) *4/52 = 1/13*
C) 1/4
D) 13/52
Rationale: 4 Kings out of 52 cards = 4/52 = 1/13.
10. Which is a parameter?
A) Sample mean
B) Sample standard deviation
C) Population mean
D) Sample proportion
Rationale: A parameter describes a population; sample statistics describe samples.
11. The standard deviation of the sampling distribution of the
sample mean is called the:
A) Variance
B) Standard error
