Sort of like Vocab
How good is that Fit?
What does it mean?
Your Pattern did What?
Mixed Review
Random
100
What does the r value tell us (2 things!)?
The strength and direction of a correlation
100
Which would have the larger r value?
Scatterplot A
100
Ireland wants to see the relationship between the number of number of movies actors have been in (x) and their net worth in millions (y) She finds that the equation is y = .32x + 0.05 and the R2 =.18.
What does the R2 mean
That 18% of the change in net worth can be explained by the change number of movies you are in.
100
As x increases, y increases
what is a positive correlation?
100
How many girls were included in this study
235
100
This is a common name for Ethyl Alcohol
What is Ethanol
200
Which of the following r values represents the best correlation?
a) .89
b) .67
c) -.96
d) .95
c
200
Describe the realtive strength and the direction of this correlation
moderate to strong negative
200
Ireland wants to see the relationship between the number of number of movies actors have been in (x) and their net worth in millions (y) She finds that the equation is y = .32x + 0.05 and the R2 =.18.
What does the slope mean (be careful - this is a regression)
That overall (in general, on average) your net worth increases .32 million for every movie you are in.
200
What is the difference between the slope of a line and a regression line?
One is an estimate
200
This measure of center is less susceptible to outliers than the mean.
What is the median
200
In "The Wizard of Oz", the lion was in search of this
What is Courage?
300
The percent of variation in the response variable that is explained by the variation int he predictor
What is the R2 value?
300
Judging by the residual plot below, was the correct graph type fit to the data?
Yes
300
Ireland wants to see the relationship between the number of number of movies actors have been in (x) and their net worth in millions (y) She finds that the equation is y = .32x + 0.05 and the R2 =.18.
What would you predict for someone who has been in 6 movies? Do not round
1.97 million.
300
You make a scatterplot of height versus weight for 2,000 kids from birth to 18. What sort of pattern would you expect to see? (describe the relative strength and the direction)
Strong Positive
300
this signifies a score below the mean
What is a negative z-score
300
This is the primary ingredient in hummus
What are chickpeas (Garbanzo Beans)
400
This is a way of estimating the 'average' error in a prediction from a regression line
What is RMSE?
400
True of false. Based on the residual plot below, The prediction errors generally decrease as the x value decreases.
False.
400
Ireland wants to see the relationship between the number of number of movies actors have been in (x) and their net worth in millions (y) She finds that the equation is y = .32x + 0.05 and the R2 =.18.
What does the y-intercept mean?
That in general those starting in the career (0 movies so far) have a net worth of .05 million (or 50,000)
400
You make a scatterplot that shows the number of concerts members of the senior class (at a large HS) have bought versus the money in their checking account. What sort of pattern do you expect to see?
Include relative strength and direction
Weak to moderate negative
400
This measures how spread out a data set is
What is standard deviation?
400
He was the skipper of PT 109 during World War II.
Who is John F. Kennedy
500
Plotting these can help us to determine if we fit the correct type of graph (linear, quadratic, exponential etc.) to our data.
What are residuals?
500
Tom says that for a regression line to be useful to make predictions, you need the RMSE to be under 50.
Kayla disagrees and says it is fine as long as the RMSE is below 100.
Who do you agree with, and why?
Neither, it depends on the context, units and scale.
500
Andrice fits a regression line to his data attempting to predict the age of a clam based on the thickness of its shell (in cm) at the hinge. He reads the equation from the top of google sheets
1.04*x +-2.5E-05 R2 =.62
Predict the age of a clam that is 2 cm thick. Please do not round.
2.799975 years
500
Women's shoe sizes fit a normal curve. The mean US women's shoe size is 8 with a standard deviation of 1.5
What percentage of woman have shoes sizes between 5 and 9.5?
81.5%
500
These are the five boroughs of New York City
What are Brooklyn, Queens, The Bronx, Manhattan and Staten Island?