C957 Applied Algebra TEST- QUESTIONS AND
ANSWERS | RATED 100% CORRECT!!
You work in IT on many different platforms (PC, Mac, Linux, etc.) with different types of
software and tools. One of your friends also works in IT. She is the administrator of a
college learning management system.
Which choice is a qualitative variable?
Qualitative variables are categorical.
The platform you work on for any given project
Crime starts increasing in a neighborhood. In response, the local police station increases
the number of patrols they do in the neighborhood.
Which variable is the independent variable in this context?
Think about the order in which these events occur.
The number of crimes
All Corners and Real Voice are cell phone service providers. Their customer satisfaction
rates since 2000 are shown in the following graph.
When did both companies have the same customer satisfaction rate?
Those two companies had the same customer satisfaction rate in late 2010
A new online game, Salem Trial, was launched on January 1. The following is a scatter plot
of the number of daily users on the first day of each month since January 1. A curve of best
fit was found, with a coefficient of determination of r2=0.92.
, Which statement is true about the outlier?
The outlier does not affect the prediction of the number of gamers on January 1 for the next year
The number of memberships at Sunrise Sky Spa since 2000 can be modeled by the function
m(t)=0.6t4−20t3+200t2−500t+1000,
where t is the number of years since 2000. Calculate the number of memberships in mid-
2005
There were approximately 1,522 memberships in mid-2005
A data point that "lies" significantly "outside" the general trend in a set of data; it could
prove to be a true outlier that should be removed or it could be legitimate data that should
remain in the data set
Possible outlier
With a strong r2 is it reasonable to remove outliers
yes
The following table shows y, the price per gallon of gas as a function of x, the quantity of
gas (in millions of gallons).
*Note the lines through the various points are shown with a dash, while the curve
representing the function is solid.
Referring to the choices below and the graph, find the greatest decrease represented by the
instantaneous rate of change.
x = 420
ANSWERS | RATED 100% CORRECT!!
You work in IT on many different platforms (PC, Mac, Linux, etc.) with different types of
software and tools. One of your friends also works in IT. She is the administrator of a
college learning management system.
Which choice is a qualitative variable?
Qualitative variables are categorical.
The platform you work on for any given project
Crime starts increasing in a neighborhood. In response, the local police station increases
the number of patrols they do in the neighborhood.
Which variable is the independent variable in this context?
Think about the order in which these events occur.
The number of crimes
All Corners and Real Voice are cell phone service providers. Their customer satisfaction
rates since 2000 are shown in the following graph.
When did both companies have the same customer satisfaction rate?
Those two companies had the same customer satisfaction rate in late 2010
A new online game, Salem Trial, was launched on January 1. The following is a scatter plot
of the number of daily users on the first day of each month since January 1. A curve of best
fit was found, with a coefficient of determination of r2=0.92.
, Which statement is true about the outlier?
The outlier does not affect the prediction of the number of gamers on January 1 for the next year
The number of memberships at Sunrise Sky Spa since 2000 can be modeled by the function
m(t)=0.6t4−20t3+200t2−500t+1000,
where t is the number of years since 2000. Calculate the number of memberships in mid-
2005
There were approximately 1,522 memberships in mid-2005
A data point that "lies" significantly "outside" the general trend in a set of data; it could
prove to be a true outlier that should be removed or it could be legitimate data that should
remain in the data set
Possible outlier
With a strong r2 is it reasonable to remove outliers
yes
The following table shows y, the price per gallon of gas as a function of x, the quantity of
gas (in millions of gallons).
*Note the lines through the various points are shown with a dash, while the curve
representing the function is solid.
Referring to the choices below and the graph, find the greatest decrease represented by the
instantaneous rate of change.
x = 420
