Examining Distributions Checkpoint 2 University of Alabama EC 410
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Module
EC 410
Institution
EC 410
MODULE EXAMINING DISTRIBUTIONS
Step 1 of 1
Question 1 of 7
Question 2 of 7
The distribution of the amount of money spent by students for textbooks in a semester is
approximately normal in shape with a mean of $240 and a standard deviation of $25.
According to the Standard Deviation Rule, in a...
module examining distributions step 1 of 1 question 1 of 7 question 2 of 7 the distribution of the amount of money spent by students for textbooks in a semester is
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Examining Distributions Checkpoint 2 | Acrobatiq Page 1 of 6
BACK TO COURSE (/COURSEWARE/PAGE/SL_STATS_V1/DEVIATION3)
MODULE EXAMINING DISTRIBUTIONS
Step 1 of 1
Question 1 of 7 Points: 10 out of 10
The distribution of the amount of money spent by students for textbooks in a semester is
approximately normal in shape with a mean of $240 and a standard deviation of $25.
According to the Standard Deviation Rule, in a semester, almost all (99.7%) of the students spent on
textbooks:
between 165 and 315 dollars.
between 190 and 290 dollars.
between 215 and 265 dollars.
less than 215 dollars or more than 265 dollars.
above 240 dollars.
Good job! The Standard Deviation Rule tells us that for distributions that have the
normal shape, approximately 99.7% of the observations fall within three standard
deviations of the mean. Indeed, 165 = 240 - 3 * 25 and 315 = 240 + 3 * 25 are
exactly three standard deviations below and above the mean, respectively.
Question 2 of 7 Points: 10 out of 10
The histogram below displays the distribution of 50 ages at death due to trauma (unnatural accidents
and homicides) that were observed in a certain hospital during a week.
This study source was downloaded by 100000858936669 from CourseHero.com on 02-04-2023 10:55:01 GMT -06:00
To describe the center and spread of the above distribution, the appropriate numerical measures are:
the IQR and the standard deviation
the median and the IQR
the mean and the median
the mean and the standard deviation
Any of the above would be appropriate, it is just a matter of taste.
Good job! When the distribution is skewed or has outliers, the best measure of
center is the median, and the associated best measure of spread is the IQR. In
this exercise, the distribution is skewed (it has a "tail" towards one side) and it
also has a suspected outlier (the value at 90).
Question 3 of 7 Points: 10 out of 10
A student survey was conducted in a major university, where data were collected from a random
sample of 750 undergraduate students. One variable that was recorded for each student was the
student's answer to the question: What region of the country did you live in just prior to enrolling in
this university? Northeast/Southeast/Northwest/Southwest/Midwest/Outside the U.S.
These data would be best displayed using which of the following?
histogram
IQR
boxplot
This study source was downloaded by 100000858936669 from CourseHero.com on 02-04-2023 10:55:01 GMT -06:00
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