Variables
Creating and Reading Scatterplots
Correlation
Lines of Best Fit
100
This variable goes on the x-axis.
What is the independent variable?
100
Should there be an equal number of points above and below the line of bets fit?
Yes
100
What type of correlation does this graph show?
What is positive?
100
The linear regression equation for a data set is y = 21.2x + 23.5, where y represents the number of balloons sold by a party store each week and x represents the week number. This is the number of balloons the store will expect to sell during week 8.
What is 191 balloons?
200
This variable is impacted by the other variable and is placed on the y-axis.
What is the dependent variable?
200
Which point is the outlier?
What is approximately (375, 13)?
200
What type of correlation is shown in the scatter plot?
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What is negative?
200
The linear regression equation for a data set is y = − 2.8x + 70.8, where y is the temperature in degrees Fahrenheit and x is the number of hours since 8 a.m. The slope represents this.
What is a decrease of 2.8 degrees Fahrenheit for each hour that goes by?
300
If I am graphing the number of shots made and the hours of practice for a player, which would be the independent variable?
What is the number of hours of practice?
300
Based on the scatter plot, this it the price for a 0.25 carat ring.
What is about 650?
300
This is the impact of television size on the amount of time someone spends watching tv.
What is no correlation? TV size has no impact on the amount of time you watch tv.
300
The scatter plot represents the estimated mosquito population within a certain radius of a city park starting in the year 2010. The linear regression that best represents the data is y = 680x + 11,722. This is a reasonable estimate for the number of mosquitos in 2025.
What is unable to calculate since the value falls outside of the given set?
400
On a graph showing the relationship between salary and years of experience which variable would be the dependent variable?
What is salary?
400
Based on the scatterplot, what is the expected price for a 0.15 carat?
What is about 300.
400
This occurs when one variable increases as the other variable increases.
What is positive correlation.
400
What is the gradient and y-intercept of the line of best fit with formula y = 400 - 20x?
Gradient = 400
y-intercept = -20
500
Write a sentence describing the relationship between the average daily temperature and the number of beach visitors.
The number of beach visitors increases as the average daily temperature increases.
500
This is the name of the line that describes the trend in a scatterplot.
What is a line of best fit or trend line?
500
This occurs when there appears to be no trend in the data.
What is no correlation?
500
If the depdendent variable is equal to 12, what is the estimate for the dependent variable for a line of best fit with formula
y = 30x - 25
335