Scatter Plots
What type of graph uses coordinate points to display values for two different numerical variables?
Scatter plots
As the outside temperature drops, hot chocolates sales increases. What type of association is this?
What I the straight line drawn through the center of a data cluster to show the general trend called?
Line of best fit(or trends line)
In the linear equation y=mx+b, which variable(letter) represent the slope?
m=slope
What type of table is used to organized and display frequencies for two categorial variables?
Two way tables
When graphing study time and test scores, which variables belongs on the x-axis?
Study time(the independent variable)
As a child's age increases. their vocabulary size increases. What type of association is this?
Positive Association
True or False: A line of best fit must connect the first and last data point on the graph.
False. It should go through the middle of the data, balancing points above and below the line.
In the linear equation y=mx+b, which variable(letter) represents the starting value or y-intercept?
b=starting value or y-intercept
If a table shows 40 students play sports and 25 of those students also play an instrument, how many spots players do not play an instrument?
15 students don't play an instrument.
What term describes a single data point that lies far away from the general patterns of the rest of the data?
Outlier
If data points form a distinct U-shape or curve rather than a straight path, what type of association is this?
Non-linear Association
If a line of best fit points downward from left to right, what kind of correlation does the data have?
Negative Correlation
The line of best fit for a plant's growth is y=3x+2, where y is height in inches and x is weeks. What does the 3 represent in this context.
The plant grows 3 inches per week (unit rate/ rate of change)
How do you mathematically calculate a relative frequency or proportion from a two way table?
Divide the specific category amount by the total amount.
What do we call a distinct, dense group of data points gathered closely together in a specific area of the data?
Cluster
A scatter plot comparing a student height and their math grade shows dots scattered randomly with no pattern. Describe the association.
No association.
What is the primary mathematical purpose of drawing a line of best fit on a scatter plot?
To make estimates or predictions for data point data that are on the graph.
The line of best fit for a plant's growth is y=3x+2, where y is height in inches and x is weeks. What does the 2 represent in the context?
The plant starting height was 2 inches.
In a survey of 50 students,10 are 8th graders who ride the bus. What I the relative frequency (as a percentage) of 8th graders who ride the bus out of the total students?
20%(1/5)
To investigate if taller people have larger shoes sizes, which variables is the dependent variable (y-axis)?
Show size
Give a real word example of two variables that would have a strong negative linear association
Beautiful stories.
If a scatter plot shows a distinct non-linear cluster of data, why shouldn't you draw a straight line of best fit.
The line of best fit for a plant's growth is y=3x+2, where y is height in inches and x is weeks. Using the equation predict the height the plant after 10 weeks.
32 inches
How can you use relative frequencies to determine if there is an association between two categorical variables?
By comparing the percentages; if the percentages are significantly different between the groups, there is an association.