This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: If the coefficient of correlation r = 0 .80, the standard deviations of X and Y are 20 and 25, ... (Read 25 times)

vicky

  • Hero Member
  • *****
  • Posts: 586
on: Jun 24, 2018
If the coefficient of correlation r = 0 .80, the standard deviations of X and Y are 20 and 25, respectively, then Cov(X, Y) must be 400.
 a. True
  b. False
   Indicate whether the statement is true or false

Question 2

The test for the equality of two population variances is based on the:
 a. difference between the two sample variances.
  b. ratio of the two sample variances.
  c. sum of the two sample variances.
  d. product of the two sample variances.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

janeli1

  • Sr. Member
  • ****
  • Posts: 330
Reply #1 on: Jun 24, 2018
Answer to Question 1

TRUE

Answer to Question 2

B


vicky

  • Member
  • Posts: 586
Reply 2 on: Jun 24, 2018
Great answer, keep it coming :)

emsimon14

  • Member
  • Posts: 344
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

Did you know?

The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.

Did you know?

As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

Did you know?

Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.

Did you know?

Medication errors are more common among seriously ill patients than with those with minor conditions.

Cumulative Standard Normal Distribution Cumulative Standard Normal Distribution
Generalized pressure drop correlation Generalized pressure drop correlation
Standard reduction potentials of the major respiratory electron carriers Standard reduction potentials of the major respiratory electron carriers
Some Standard Shapes of Greek Vessels Some Standard Shapes of Greek Vessels
Assume z is a standard normal random variable. What is the value of z if the area to the right ... Assume z is a standard normal random variable. What is the value of z if the area to the right ...
Table - Correlation Analysis Table - Correlation Analysis
Video: Photosynthesis and Van Helmont Experiment

For a complete list of videos, visit our video library