STA301 Quiz 3 Jan 2026 Set 2

A. Binomial distribution

B. Normal distribution

C. Uniform distribution

D. Poisson distribution Copied: 1/8/2026, 10:59:48 PM

Question:

The shape of the Poisson distribution is:

A. Negatively skewed B. J shaped

C. Positively skewed

D. U shaped Copied: 1/8/2026, 11:00:02 PM

Question:

If we have two normally distributed populations then sampling distribution of the difference of sample means will be:

A. Normal distribution

B. Chi-square distribution C. F-distribution D. t-distribution Copied: 1/8/2026, 11:00:14 PM

Question:

Which of the following statements is correct?

1. A point estimate is a single value estimate of the value of a population parameter
2. All of the above statements are correct
3. A point estimate is an estimate of the range of a population parameter
4. A point estimate is an unbiased estimator if its standard deviation is the same as the actual value of the population standard deviation

Correct answer: A point estimate is a single value estimate of the value of a population parameter

Copied: 1/8/2026, 11:00:27 PM

Question:

The mean deviation of the normal distribution is approximately:

A. 7/8 of the S.D B. 3/4 of the S.D C. 1/2 of the S.D

D. 4/5 of the S.D

Copied: 1/8/2026, 11:00:42 PM

Question:

The probability mass function p(x) of a discrete random variable X is: P(0)=0.10, P(1)=0.15, P(2)=0.45, P(3)=0.05, and P(4)=0.25.

WHat is the value of cumulative distribution function F(x) at X = 3?

1. 0.65
2. 0.35
3. 0.75
4. 0.45

Correct answer: 0.75

Copied: 1/8/2026, 11:00:55 PM

Question:

E(3X + 5) = ?

1. 3(X) + 5.
2. E3(X) + 5.
3. 3 E(X) .
4. 3 E(X) + 5.

Correct answer: 3 E(X) + 5.

Copied: 1/8/2026, 11:01:10 PM

Question:

A random experiment is a one in which we repeat it a large number of times under similiar conditions an it produces:

A. Different results

B. Same results C. Independent results D. None of the above Copied: 1/8/2026, 11:01:26 PM