MATH 225N Stat correlation and Y-intercepts Quiz
2020 – Chamberlain College of Nursing
Question
A plot of time versus the price of a best-selling model of television has horizontal units
of years since 2000 and verti
...
MATH 225N Stat correlation and Y-intercepts Quiz
2020 – Chamberlain College of Nursing
Question
A plot of time versus the price of a best-selling model of television has horizontal units
of years since 2000 and vertical units of dollars. The best fit line of the data are defined
by the equation y=−75x+550, where x=year and y=price.
What are the units of the slope?
Perfect. Your hard work is paying off ?
year
dollars
dollars per year
years per dollar
television model
Answer ExplanationCorrect answer:
dollars per year
The slope of the best fit line has units of dollars per year because the line represents the
number of dollars the price drops each year. The price decreases as opposed to increases
because the slope is negative.
Question
Which of the following data sets or plots could have a regression line with a negative yintercept? Select all that apply.
Great work! That's correct.
•
the percent change in the land area in the arctic circle covered by ice as a function of the
tons of CO2 produced by humans
• •
the change in the square mileage in the arctic circle covered by ice as a function of the
tons of CO2 produced by humans
• •
the number of people living on a volcanic island as a function of the number of days
since the last volcanic eruption
••
the difference in the number of ships launched by competing ship builders as a function
of the number of months since the start of last year
•
Answer Explanation
Correct answer:
the percent change in the land area in the arctic circle covered by ice as a function of the
tons of CO2 produced by humans
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