Let X and Y be random variable with the following distributions respectively :X 1 2 3 4 5 P 0.1 0.2 0.4 0.2 0.1 Y 10 20 35 50 60 P 0.1 0.2 0.4 0.2 0.1
Skewness of distribution of X and Y are same, Coefficient of Variations are not same
Both distributions are symmetric about their means: X has mean 3 with values 1, 5 and 2, 4 at equal distances and equal probabilities, and Y has mean 35 with 10, 60 (distance 25) and 20, 50 (distance 15) carrying equal probabilities.
A symmetric distribution has all odd central moments equal to 0, so the skewness of X and of Y is 0 in both cases, i.e. the skewness is the same.
For X: \(Var(X) = 0.1(4) + 0.2(1) + 0.4(0) + 0.2(1) + 0.1(4) = 1.2\), so \(\sigma_{X} \approx 1.095\) and \(CV_{X} = 1.095/3 \approx 0.365\).
For Y: \(Var(Y) = 0.1(625) + 0.2(225) + 0.4(0) + 0.2(225) + 0.1(625) = 215\), so \(\sigma_{Y} \approx 14.66\) and \(CV_{Y} = 14.66/35 \approx 0.419\).
The coefficients of variation therefore differ, because Y is not a linear rescaling of X (the gaps 10, 15, 15, 10 are uneven), so any statement claiming equal coefficients or unequal skewness fails.
Check: \(E(X) = 0.1 + 0.4 + 1.2 + 0.8 + 0.5 = 3\) and \(E(Y) = 1 + 4 + 14 + 10 + 6 = 35\), confirming the means used, and 0.365 ≠ 0.419.
Hence, Skewness of distribution of X and Y are same, Coefficient of Variations are not same.
Similar Questions
Let \(\varphi, \psi\) be the formula, \(\varphi \models \Psi\), if and only if \(\varphi \models \Psi\) is a :
Which of the following relations defined on X = {1, 2, 3} is an equivalent relation ?
A rod is divided into six segment is to be colored with one or more of 4 different colors. In how many ways can this be done ?
Consider the following linear programming problem : Maximize \(z = 5x_{1} + 2x_{2} + 3x_{3} - x_{4} + x_{5}\) Subject to : \(x_{1} + 2x_{2} + 2x_{3} + x_{4} = 8\), \(3x_{1} + 4x_{2} + x_{3} + x_{5} = 7\), \(x_{1}, x_{2}, x_{3}, x_{4}, x_{5} \geq 0\) What will be the basic feasible solution after iteration 1 ?
The thickness of a graph G is defined as minimum number of (edge-disjoint) planar subgraphs into which G can be decomposed. The thickness of G is defined as \(\theta(G)\). What is the thickness of planar graph ?
A committee is to be selected from 5 candidates a, b, c, d and e. The selection must satisfy all the following conditions :
• Either a or b must be included, but not both
• Either c or e or both must be included
• If d is included then b must be included
• Either a or c are included or neither is included.
• If e is included, then c and d must be included. How should selection be made ?
Let us consider the letters from a through h, and all 5 letters are made using these letters. (words are just strings of letters). How many of these words contain no repeated letters ?
Let us consider the following primal problem : Maximize \(z = 2x_{1} + x_{2}\) Subject to \(x_{1} - x_{2} \leq 4\), \(x_{1} - x_{2} \leq 2\), \(x_{1}, x_{2} \geq 0\) What will be its dual problem ?
Identify an appropriate operation sequence with respect to execution of a machine level language instruction.
The “instruction decode” phase in CPU’s instruction cycle is responsible to _____ .
Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
