Random Facts About Ms. Wanner
He's her brother.
What is the equation for linear regression?
y=mx+b
This is the symbol (or letter we use) for the slope.
What is m?
This is the symbol for the y-intercept.
What is b?
Describe a coefficient of deterimination .9 in terms of strength
Strong Correlation
How many pets does Ms. Wanner have and what kind of pets are they?
5, three cats and two horses
Predicted Price = 18.617x + 103.929 Capacity. This is the regression equation for disk space Capacity (in megabytes) versus Price at a local store. With a capacity of 2 mb, what would you expect the price to be?
$226.475
In the equation: Sales=91.34(Number of Sales People Working)+8106. What is the slope?
91.34
In the equation y=7x+600, this is the y-intercept
What is 600?
Which value on a CODAP graph is the coefficient of determination
r^2
What musical instrument does Ms. Wanner Play?
Drums
Ice Cream Sales=13.2(Temperature in Fahrenheit)-605
What is the equation of the line?
In the equation Verbal SAT Score=.6943(Math SAT Score) +171, write a sentence the interprets the slope in context.
For every point earned on the Math SAT Score, we can predict the Verbal SAT Score will increase by .6943 points.
The linear model for a local store's Number of Sales people working versus Sales is as follows: Sales = 91.34(Number of Sales People Working)+8106. What is the y-intercept?
$8,106
A restaurant's menu items are compared in terms of correlation. Sugar versus Calories have a correlation of 0.25. Sugar versus Protein has a coefficient of determination of .68. Which has a stronger correlation?
Sugar versus Protein.
Where did Ms. Wanner go to college?
University of Portland, University of Texas, and Portland State University
The linear model for a local store's Number of Sales people working versus Sales is as follows: Sales =91.34(Numer of Sales People Working) + 8,106. With 14 people working, what would you expect sales to be?
$9,384.76
Predicted Price = 18.617 + 103.929( Capacity). This is the regression equation for disk space Capacity (in megabytes) versus Price (in dollars) at a local store. What does the slope of 103.929 mean in this context?
For every 1 mb increase in capacity, the price increases by $103.929.
Predicted Price = 103.929 Capacity+18.617. This is the regression equation for disk space Capacity versus Price at a local store. Does the y-intercept have meaning?
No, no one would buy a disk with zero capacity.
A student says, "There was a very strong correlation of 1.22 between Sugar and Fat content." Explain the mistake made here.
Correlation cannot be greater than 1.
How many children does Ms. Wanner have? Bonus: $100 for each name
3, Austin, Tristan, Tommy
An analysis of Math SAT versus Verbal SAT scores gives an equation of Predicted Verbal SAT Score =.6943(Math SAT Score)+ 171. What would you predict someone's Math SAT Score to be if their Verbal SAT Score is 532? Round your answer to the nearest point.
520
The linear model for a local store's Number of Sales people working versus Sales is as follows: Sales = 91.34(Number of Sales People Working)+8106. What does the slope mean in this situation?
For every increase of 1 sales person working, sales increase by $91.34.
The linear model for a local store's Number of Sales people working versus Sales is as follows: Sales = 8,106 + 91.34(Number of Sales People Working). Does the y-intercept have meaning in this equation?
No, when no one is working, there should be no sales. This is just a starting point for the data.
Two variables produce a negative correlation. How will this affect the slope?
The slope will be negative.