List of top Economics Questions on Statistical Concepts

Calculate the standard deviation for the following sample: 8, 7, and 9.

What is the geometric mean of 2, 4 and 8?

Match List-I with List-II \[\begin{array}{|c|c|} \hline \textbf{Nature of Skewness for a Distribution} & \textbf{Relationship between Arithmetic Mean (AM), Median and Mode} \\ \hline \text{(A) Positively Skewed} & \text{(I) AM = Median = Mode} \\ \hline \text{(B) Moderately Skewed} & \text{(II) AM < Median < Mode} \\ \hline \text{(C) Negatively Skewed} & \text{(III) AM - Mode = 3 (AM - Median)} \\ \hline \text{(D) Symmetric Distribution} & \text{(IV) AM > Median > Mode} \\ \hline \end{array}\] Choose the correct answer from the options given below:

Which of the following statements are valid assumptions of the Ordinary Least Squares regression model?
(A) Expected value of the error term is zero
(B) Heteroskedasticity
(C) The model is linear in parameters
(D) Autocorrelation
Choose the correct answer from the options given below:

In a Poisson distribution, the probability mass function is given by: \(\rho(x) = \frac{e^{-2}(2)^3}{3!},\) the mean value is:

Which of the following statements reflects a property of the t distribution?
(A) It ranges from -∞ to +∞
(B) Its mean is the average of X
(C) It ranges from 0 to +∞
(D) It does not vary with the change in degrees of freedom
Choose the correct answer from the options given below:

Match List-I with List-II

List-I(Statistical Concepts)		List-II(Description)
A	Power of a test	I	1- probability of making type II error
B	Multicollinearity	II	Where the sample mean differs from the population mean
C	Biased estimator	III	Correlation between explanatory variables in a regres sion
D	White noise error	IV	Errors with zero mean and constant standard deviation

Choose the correct answer from the options given below