STA301 Midterm Preparation by ZB

Q1. What is mass communication?

1. Communication between two people
2. Communication from one source to many receivers
3. Communication between small groups
4. Communication via non-verbal channels

Answer: B) Communication from one source to many receivers

Q2. Which of the following is an example of mass media?

1. Face-to-face communication
2. Telephone call
3. Television broadcast
4. Written letter

Answer: C) Television broadcast

Q3. What is the main characteristic of mass communication?

1. One-to-one communication
2. Personal and intimate
3. One-to-many communication
4. Two-way communication

Answer: C) One-to-many communication

Q4. Which of these is a role of mass communication in society?

1. Providing entertainment
2. Educating the public
3. Shaping public opinion
4. All of the above

Answer: D) All of the above 1. What is the mean of the dataset 3, 7, 5, 8, 10?

Q6. If two events are mutually exclusive, what is the probability of both events occurring?

1. 1
2. 0
3. 0.5
4. Cannot be determined

Answer: b) 0

Q7. What is the probability of rolling a 3 on a fair six-sided die?

1. 1/6
2. 1/2
3. 1/3
4. 1/12

Answer: a) 1/6

Q8. If P(A) = 0.4 and P(B) = 0.5, what is P(A ∩ B) for independent events A and B?

1. 0.2
2. 0.1
3. 0.9
4. 0.25

Answer: a) 0.2

Q9. Which of the following is NOT a property of a probability distribution?

1. The sum of the probabilities must be 1.
2. All probabilities must be between 0 and 1.
3. The probabilities can be greater than 1.
4. Probabilities are non-negative.

Answer: c) The probabilities can be greater than 1.

Q10. If two events A and B are independent, then:

1. P(A ∩
2. = P(A) + P(B)
3. P(A ∩
4. = P(A) * P(B)
5. P(A ∩
6. = 0
7. P(A ∩
8. = P(A) - P(B)

Answer: B) = P(A) + P(B) P(A ∩ B) = P(A) * P(B)

Q11. The binomial distribution is used when:

1. There are two possible outcomes in each trial.
2. The trials are not independent.
3. The outcomes are continuous.
4. The number of trials is not fixed.

Answer: a) There are two possible outcomes in each trial.

Q12. Which of the following distributions is continuous?

1. Binomial
2. Poisson
3. Normal
4. Geometric

Answer: c) Normal

Q13. The expected value of a random variable X with a normal distribution is:

1. The mean of the distribution
2. The mode of the distribution
3. The median of the distribution
4. The range of the distribution

Answer: a) The mean of the distribution

Q14. The area under the curve of a normal distribution between -∞ and +∞ is:

1. 0
2. 0.5
3. 1
4. 2

Answer: c) 1

Q15. Which of the following is true for a standard normal distribution?

1. Mean = 0, Standard deviation = 1
2. Mean = 1, Standard deviation = 0
3. Mean = 1, Standard deviation = 1
4. Mean = 0, Standard deviation = 0

Answer: a) Mean = 0, Standard deviation = 1