Beginning of dialog window. Escape will cancel and close the window.
End of dialog window.
This is a modal window. This modal can be closed by pressing the Escape key or activating the close button.
This is a modal window.
Question 1
46
Question
1.
Which is a valid property of a density curve?
A.
B.
C.
Incorrect. Density curves are used to find probabilities so the total area has to equal 1.0.
Correct. Density curves are used to find probabilities so the total area has to equal 1.0.
Incorrect. Try again.
2
Question 2
81
Question
2.
Why do we model data with a density curve?
A.
B.
C.
Incorrect. Density curves were invented to find probabilities.
Correct. Density curves were invented to find probabilities.
Incorrect. Try again.
2
Questions 3-4
131
Question
3.
True or false: Density curves are smooth curves that follow the shape of the corresponding histogram.
A.
B.
Incorrect. This is a correct statement.
Correct. This is a correct statement.
Incorrect. Try again.
2
Question
4.
True or false: For density curves the height of the curve at a particular X-value equates to the proportion of values in the population that have that X value.
A.
B.
Incorrect. Area under the curve between two values estimates the proportion of the population in that interval.
Correct. Area under the curve between two values estimates the proportion of the population in that interval.