By: Prof. Dr. Fazal Rehman | Last updated: November 22, 2024
The mean of a dataset is calculated as:
(A) Sum of all observations divided by the total number of observations
(B) The middle value of the data
(C) The most frequent value
(D) None of these
Answer: (A) Sum of all observations divided by the total number of observations
The variance of a dataset measures:
(A) Central tendency
(B) Spread or dispersion
(C) Skewness
(D) None of these
Answer: (B) Spread or dispersion
The standard deviation is:
(A) The square root of variance
(B) The square of variance
(C) The reciprocal of variance
(D) None of these
Answer: (A) The square root of variance
The mode of a dataset is:
(A) The average value
(B) The most frequent value
(C) The middle value
(D) None of these
Answer: (B) The most frequent value
A probability density function (PDF) is used to:
(A) Define discrete probabilities
(B) Define continuous probabilities
(C) Measure central tendency
(D) None of these
Answer: (B) Define continuous probabilities
A random variable is:
(A) A fixed number
(B) A function that assigns outcomes to real numbers
(C) Always positive
(D) None of these
Answer: (B) A function that assigns outcomes to real numbers
The central limit theorem states that:
(A) The sum of a large number of independent random variables tends toward a normal distribution
(B) Every dataset is normally distributed
(C) Variance is always constant
(D) None of these
Answer: (A) The sum of a large number of independent random variables tends toward a normal distribution
Skewness measures:
(A) The central tendency of data
(B) The asymmetry of the data distribution
(C) The spread of data
(D) None of these
Answer: (B) The asymmetry of the data distribution
A statistic is:
(A) A numerical summary of a sample
(B) A numerical summary of a population
(C) Always equal to the parameter
(D) None of these
Answer: (A) A numerical summary of a sample
The covariance between two variables measures:
(A) The correlation between them
(B) The joint variability of two variables
(C) The difference between their means
(D) None of these
Answer: (B) The joint variability of two variables
