POS 401 Quiz 2
docx
keyboard_arrow_up
School
Arizona State University *
*We aren’t endorsed by this school
Course
401
Subject
Mathematics
Date
Apr 3, 2024
Type
docx
Pages
6
Uploaded by ChancellorPheasantPerson390
Score for this attempt: 11
out of 11
Submitted Mar 24 at 7:23pm
This attempt took 2 minutes.
Question 1
1 / 1 pts
This type of variable is qualitative in nature, and its different values are not ordered. Correct!
Categorical
By qualitative, we mean that it is not quantified in any way and that it cannot be manipulated through math. Ordinal
Question 2
1 / 1 pts
These variables take only on integer values but can be manipulated through math Correct!
Count variables
Ordinal variables
Question 3
1 / 1 pts
Continuous variables must be able to take on any value on the real line. True
Correct!
False
Continuous variables could take on an infinite number of values within
their range. Question 4
1 / 1 pts
Statistical distributions are:
Correct!
A tally of how many times a variable takes on each of its possible values
In other words, distributions describe the frequencies of each value a variable can take.
A graph showing the frequencies of each of the values of a variable
The maximum and minimum values a variable can take
Question 5
1 / 1 pts
What is a histogram?
No answer text provided.
Correct!
A graph that groups potential values of a variable into bins, and show the proportion of observations that fall into each bin
An alternative to histograms is density plots. Density plots are used for continuous variables since they operate
like histograms with tiny bins and can therefore show the variation of a continuous variable with more detail. A graph that shows the distribution of the data generating process
Question 6
1 / 1 pts
Why is it important to examine the distribution of a variable? For this question, you need to select multiple correct answers. Pick all that apply.
Correct!
Because the distribution contains all the information of a variable
Because it tells us how to analyze the data
Correct!
Checking the distribution can help us track changes in a variable across time
Correct!
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
Because it can let us know if we are dealing with outliers
Question 7
1 / 1 pts
We use these two quantities to summarize a distribution. Pick all that apply.
Range
Correct!
Location
Location is a measure of where in the possible values of a variable we find most variables Correct!
Scale
The scale of a variable is a measure of how widespread is our data within the range of a variable.
Question 8
1 / 1 pts
This is a measure of central tendency that is susceptible to outliers
Correct!
Mean
Recall also that the mean is just the average: the sum of all observations divided by the number of observations.
Median
Standard deviation
Question 9
1 / 1 pts
This measure of the scale of a variable tells us how far away the typical observation is from the mean. Interquartile range
Correct!
Standard deviation
Please remember that the standard deviation tells us the distance to the mean
, not the median
. This is what makes it susceptible to outliers.
Question 10
1 / 1 pts
In statistics, we normally assume that our data comes from a theoretical distribution (i.e. the data generating process). One of those distributions is the normal. Which quantities do we use to describe this distribution?
A median and an interquartile range
Correct!
A mean and a standard deviation
You may wonder about the name ‘standard deviation’. It is deviation because it is measuring distance from the mean. It is standard because it is in the units of the original variable.
Question 11
1 / 1 pts
Why is the normal distribution so common in statistical analyses? Select all that apply.
Because it is convenient.
Correct!
Because it is common in nature
We observe the normal distribution in nature because it is the distribution things take when they are the result
of several forces or fluctuations that combine across time.
Quiz Score: 11
out of 11
Previous
Next
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help