« previous next »

Author Question: Identify what is wrong with each of the following statements: a. The correlation between Olympic ... (Read 44 times)

formula1

  • Hero Member
  • *****
  • Posts: 666
on: Jul 25, 2018
Identify what is wrong with each of the following statements:
 
  a. The correlation between Olympic gold medal times for the 800m hurdles and year is -0.66 seconds per year.
 
  b. The correlation between Olympic gold medal times for the 100m dash and year is -1.37.
 
  c. Since the correlation between Olympic gold medal times for the 800m hurdles and 100m dash is -0. 41, the correlation between times for the 100m dash and the 800m hurdles is +0.41.
 
  d. If we were to measure Olympic gold medal times for the 800m hurdles in minutes instead of seconds, the correlation would be -0.66/60 = -0.011.

Question 2

After conducting a survey of his students, a professor reported that There appears to be a strong correlation between grade point average and whether or not a student works. Comment on this observation.
 
  What will be an ideal response?
Stats: Modeling the World ¦ Bock, Velleman, De Veaux ¦ 4th Edition
Buy Test-Bank


tjayeee

  • Sr. Member
  • ****
  • Posts: 329
Reply #1 on: Jul 25, 2018
Answer to Question 1

a. Correlation has no units.
b. Correlation has to be between -1 and +1.
c. Correlation does not change if we reverse the role of the x and y variables.
d. Correlation does not change when we change units.

Answer to Question 2

Correlation measures the strength of a linear association between two quantitative variables. Whether or not a student works is a categorical variable, so correlation cannot be calculated between GPA and whether or not a student works.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

Did you know?

There are approximately 3 million unintended pregnancies in the United States each year.

Did you know?

Colchicine is a highly poisonous alkaloid originally extracted from a type of saffron plant that is used mainly to treat gout.

Did you know?

During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

Did you know?

Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

The positive correlation between the ability of various neuroleptics to bind to D2 receptors and ... The positive correlation between the ability of various neuroleptics to bind to D2 receptors and ...
Nine labels used to identify hazardous materials in the Global Harmonization System (GHS). Top row: ... Nine labels used to identify hazardous materials in the Global Harmonization System (GHS). Top row: ...
Testing client’s ability to identify sharp sensations Testing client’s ability to identify sharp sensations
Doty's data show a very rapid drop in late adulthood in the ability to identify smells Doty's data show a very rapid drop in late adulthood in the ability to identify smells
Table - Correlation Analysis Table - Correlation Analysis
Table - Correlation Analysis Table - Correlation Analysis
Video: Chemical Buffers - protein buffer, phosphate buffer system and bicarbonate buffer system

For a complete list of videos, visit our video library