Q24.
The coefficient of determination (r2)
is calculated as 0.49, then the correlation coefficient:
Cannot
be determined without the data
Should
be - 0.70 or 0.70
Should
be 0.
Neither
of the above
Q25. A
regression line is used for all of the following except one. Which
one is not a valid use of a regression line?
To
estimate the average value of Y at a specified value of
X.
To
predict the value of Y for an individual, given...
The minimum and maximum values of the coefficient of
determination r2 are, respectively,
A. 0 and 1
B. −1 and 1
C. −1 and 0
D. 0 and +∞
The following data represent a random sample of earwig density
(x) and the proportion of males that have forceps (y).
Earwig Density
Proportion of Males with Forceps
0.25
0.05
5.3
0.1
12.6
0.67
22
0.19
25.4
0.04
32.3
0.53
Which of the following is the correlation coefficient?
A. 0.33
B. 0.17...
1. What is the difference between Pearson’s
correlation coefficient, r, and the coefficient of
determination, r2?
What does each statistic tell us about the relationship between two
variables? What do these statistics NOT tell us about the
relationship between two variables?
Discuss how the coefficient of determination and the
coefficient of correlation are related. How are they used in
regression analysis?
A seasonal index may be less than one, equal to one, or greater
than one. Explain what each of these values mean.
A _______________ is a graphical representation of how much of a
good or service households will want to buy at different prices. A
_______________ is a graphical representation of how much of a good
or service a firm is willing to sell at some specific price. The
intersection of the demand and supply curve is called
_______________. This is where the quantity demanded is equalto the
quantity supplied. There is a _______________ of a good or service
when the quantity...