Prove that xy = x y x y ,where x and y are the means
Question:
Prove that σxy = x̅ y̅ – x̅ y̅ ,where x̅ and y̅ are the means of {xi} and {yi}, respectively, while x̅ y̅ denotes the mean of the product variable {xiyi}.
Fantastic news! We've Found the answer you've been seeking!
Step by Step Answer:
Answer rating: 50% (4 reviews)
We know that the covariance of two variables x and y is given by xy ...View the full answer
Answered By
Leeladhar Arya
working experience in chegg expert.
0.00
0 Reviews
10+ Question Solved
Related Book For
Question Posted:
Students also viewed these Mathematics questions
-
Consider a simple nonlinear regression model of the form that yi = ln1xi + ui (0.1) (i) Derive the ordinary least square estimator (OLS) of ln 1. (ii) Discuss whether the sum of the OLS residuals is...
-
Prove that xi = yi = 0, where xi and yi are as defined in Problem 2.27.
-
Prove that xiyi = xiyi = xiyi, where xi - = (Xi - ) and yi - = (Yi - ).
-
What are the "two main lines" of distortion of the view of Marx and what does Lenin think the proper view?
-
What does the term highest and best use concept mean? When is this concept applicable?
-
What information is normally obtained from a credit report?
-
Due to a nationwide recession, PC Worlds merchandise inventory is gathering dust. It is now December 31, 2010, and the \($162,000\) that PC World paid for its ending inventory is \($14,000\) higher...
-
Coaxial cable. A solid conductor with radius a is supported by insulating disks on the axis of a conducting tube with inner radius b and outer radius c (Fig). The central conductor and tube carry...
-
Donovan & Parents produces soccer shorts and jerseys for youth leagues. Most of the production is done by machine. Data on operations and costs for March follow. Units produced Machine-hours used...
-
Meet the Marcottes, Martin and Luz Marcotte that is. Martin is a successful graphics designer who is 38 years old, while Luz is a counseling psychologist, 35 years old, and is working at a State...
-
Show that one can compute the variance of a set of measurements without reference to the mean by the following formula 2 x 2m = m m * i=1 j=1 (-x) = #2 - ) (-x;). m
-
Prove that if W is an invariant subspace for A, then it is also invariant for A 2 . Is the converse to this statement valid?
-
Experiments have shown the average frequency of chirp-ing of individual snowy tree crickets (Oecanthus fultoni) to be 178 min-1 at 25.0oC, 126 min-1 at 20.3oC, and 100. min-1 at 17.3oC. a. What is...
-
Distinguish between operating, application, and communications software. What is the relative importance of each type of software to the auditor?
-
What is the 1515 rule?
-
Briefly identify how an internal audit department with a strong computer audit orientation might affect the audit plan for a heavily computerized client.
-
The chapter referred to tables, such as a payroll wage-rate table. What are the functions of such tables? What controls should be instituted to ensure the accuracy of the tables?
-
Does members commitment to the group continue to increase through the first four stages of group development?
-
Consider n pieces of rope. Each piece is colored blue at one end and red at the other. The blue ends of the ropes are randomly paired with the red ends of the ropes and tied together, one-to-one,...
-
2.) Find the Laplace transform of f(t) 7e-St cos 2t +9 sinh2 2t. Use Laplace Table. %3D
-
Draw the parallelogram spanned by the vectors Then draw its image under the linear transformations defined by the following matrices: 2 2and3 1.2 12 0 0')) 12 24
-
Let u = (u1, u2, u3)T R3 be a unit vector. Show that Qn = 2uuT - I represents rotation around the axis u through an angle .
-
Let u R3 be a unit vector. (a) Explain why the elementary reflection matrix R = I - 2uuT represents a reflection through the plane orthogonal to u. (b) Prove that R is an orthogonal matrix. Is it...
-
Give the exact values (in simplest form) if possible. Otherwise, use a calculator and approximate the result to 4 decimal places.
-
1. Abbey Co. sold merchandise to Gomez Co. on account, $35,000, terms 2/15, net 45. The cost of the goods sold was $24,500. Abbey Co. issued a credit memo for $3,600 for merchandise returned that...
-
Comparative financial statements for Weller Corporation, a merchandising company, for the year ending December 31 appear below. The company did not issue any new common stock during the year. A total...
Study smarter with the SolutionInn App