Scatter Plots
Describe what a positive association looks like in a scatter plot.
In a positive association, as one variable increases, the other variable also increases, resulting in an upward trend.
What is a linear association?
A relationship between two variables that can be represented by a straight line.
If a two-way frequency table shows 20 students prefer soccer in 8th grade and 15 in 7th, what does this tell us about grade and soccer preference?
More 8th graders prefer soccer than 7th graders, suggesting grade level might influence preference
How many solutions does this equation have?5x−8=3x+10
What is 1 Solution
Who won the World Series last Night?
LA Dodgers
What is the difference between a strong association and a weak association?
A strong association will have more clusters following the trend line, where a weak association will follow the trend line more loosely.
How do you determine if a scatter plot shows a linear association?
If the points roughly follow a straight line, there is a linear association.
If the line of best fit for a scatter plot is y = 2x + 3, what would y be if x is 4?
y = 2(4) + 3 = 11
Compare and order from least to greatest:
6.8, 6.666..., 46/7, Square root of 47
46/7, 6.666..., 6.8, square root of 47
What year was Mr. McFarland born?
1993
If a scatter plot has no visible pattern, what can you conclude about the association?
There is no association or correlation between the variables.
What is the difference between a positive and a negative linear association?
In a positive linear association, both variables increase together; in a negative linear association, one variable increases while the other decreases.
What is a two-way relative frequency table? Think of yesterdays lesson.
A table showing the percentage (or proportion) of each cell relative to the total number of observations.
Write 5,678,321 in scientific notation.
5.678321 x 106
Who is responsible for the Louisiana Purchase (Westward Expansion)?
Thomas Jefferson in 1803
How would you describe an outlier in a scatter plot?
An outlier is a data point that is far away from the other points, not fitting the general pattern of the data
When interpreting a linear model, what does the y-intercept represent?
The y-intercept is the starting value of the dependent variable when the independent variable is zero.
How do you interpret a relative frequency of 0.25 in a cell of a two-way table? (Or what is .25 as a percent?)
It means that 25% of the total observations fall into that cell’s category.
The state fair charges $14 for admission. Each ride cost $6. What is the function or expressions that represents this situation. (y=mx+b)
y = 6x +14
What is the Sloth characters name in the move the ICE age?
Sid the sloth
In a scatter plot with age on the x-axis and income on the y-axis, what type of association would you expect?
Generally, a positive association, as income tends to increase with age up to a certain point.
What is the slope of a trend line that passes through (0,15) and (2,35)?
DOUBLE POINTS IF YOU CAN WRITE THE EQUATION IN SLOPE INTERCEPT FORM.
Slope = 10
y=10x+15
If a cell has a relative frequency of 10% in a two-way table with 200 students, how many students does this represent?
20 Students
Solve for x: 7−2(x−3)=3x+1
x=12/5 or x=2.4
This remote island, located over 1,200 miles off the coast of South America, is one of the most isolated inhabited places on Earth and is famous for its nearly 1,000 monumental statues called moai, carved by the early Rapa Nui people.
What is Easter Island?