✅ 8th Grade Math (Algebra I): Scatter Plot Quiz
✅ 8th Grade Math (Algebra I): Scatter Plot Quiz
If the data points on a scatter plot generally move from the bottom-left to the top-right, what type of association is shown?
A) Negative associationB) Positive association
C) No association
D) Nonlinear association
What is the term for a data point that is located far away from the main cluster of data points?
A) ClusterB) Gap
C) Outlier
D) Trend line
Which of the following relationships would most likely show a negative association?
A) The number of hours spent studying and the grade on a test.B) The outside temperature and the amount of money spent on heating bills.
C) The height of a person and their shoe size.
D) The number of pets a person owns and their house number.
A scatter plot shows points that are randomly spread across the coordinate plane with no visible pattern. How would you describe this association?
A) Strong positiveB) Weak negative
C) No association
D) Linear association
What type of data is typically displayed on a scatter plot to investigate a relationship?
A) Univariate dataB) Bivariate data
C) Categorical data only
D) Frequency data only
In a scatter plot, what is a "cluster"?
A) A line that passes through most points.B) A single point that is very high on the y-axis.
C) A group of data points that are located close together.
D) The distance between the highest and lowest x-values.
A trend line for a scatter plot is represented by the equation $y = 3x + 10$. Based on this model, what is the predicted value of $y$ when $x = 5$?
A) 15B) 18
C) 25
D) 35
Which equation represents a line of best fit for a scatter plot showing a negative linear association?
A) $y = 4x + 2$B) $y = 0.5x - 5$
C) $y = -3x + 12$
D) $y = 10$
A scatter plot compares the number of pages in a book ($x$) to its price ($y$). The line of best fit is $y = 0.05x + 2$. What does the slope 0.05 represent?
A) The total cost of the book.B) The cost of the book cover.
C) The increase in price for each additional page.
D) The number of pages in a 2 dollar book.
A scatter plot shows the relationship between the number of cups of lemonade sold ($y$) and the temperature in degrees Fahrenheit ($x$). The y-intercept of the trend line is -50. Why might this y-intercept be considered non-viable in a real-world context?
A) You cannot sell a negative number of cups.B) Temperature cannot be measured in Fahrenheit.
C) Lemonade cannot be sold if it is cold.
D) The slope must always be positive.
If the points on a scatter plot follow a clear U-shaped pattern, how should the association be described?
A) Linear positiveB) Linear negative
C) Nonlinear
D) No association
A scientist uses a trend line $y = 2.5x + 10$ to predict the growth of a bacteria colony, where $x$ is hours and $y$ is the number of bacteria in thousands. Predict the number of bacteria after 12 hours.
A) 30,000B) 40,000
C) 45,000
D) 50,000
Which of the following would indicate the strongest linear relationship between two variables?
A) Points are widely scattered around a line.B) Points are clustered very tightly along a straight line.
C) Points form a perfect circle.
D) Points are clustered in two separate groups at opposite corners.
A scatter plot has a strong positive correlation. If an outlier is added very high above the existing trend line, how will the slope of the new line of best fit most likely change?
A) The slope will decrease.B) The slope will increase.
C) The slope will become negative.
D) The slope will stay exactly the same.
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