Question

(9)

1-

You want to test whether soil nitrogen content predicts plant height, so you measure nitrogen in the soil and plant heights from throughout Ōtautahi/Christchurch. You run a regression and have this resultant ANOVA table. What is the F value for the model?

	df	Sum of squares	Mean Squares
Model	1	7.4667	7.4667
Error	8	8.5783	1.0723

Select one:

a.
1.148874

b. 0.8704172

c. 0.143611

d. 6.963257

2-

The Pearson correlation coefficient r :

Select one:

a. Gives the same information as the R² from a regression.

b. Is insensitive to outliers.

c. Is not changed if you reverse X and Y.

d. Is a measure of the slope of a relationship between two variables.

3-

There is a probability of 0.3 that a monarch butterfly will lay eggs on any given swan plant. You sample 250 swan plants. What is the probability that you find eggs on 50 or fewer swan plants?

Select one:

a. 1.35 x 10⁵³

b. 0.0001

c. 0.0002

d. 0.9998

4-

If there are 50 students in a class and 20 of them are male, how would you use R to compute the number of unique ways to create groups of 5 female students?

Select one:

a. choose(30,5)

b. choose(50,45)

c. choose(50,5)

d. choose(20,5)

Answer 1