Variables and Vocab
LSRL
Practice?
Movies
Inference Methods
100
Apparent randomness in a residual plot tells us this.
That a linear model is appropriate
100
r is the measure of this, which indicates a linear association between 2 quantitative variables.
What is correlation?
100
If there are no patterns in a residual plot, we would say that is has this. 
What is apparent randomness?
100
This movie is about a koala bear (played by Matthew McConaughey), who starts a music competition for $100,000 even though he doesn't have the money.
What is Sing?
100
What null and alternative hypothesis should I use if I am testing for a positive relationship between 2 variable?
Ho: B=0
Ha: B>0
200
This tells us the % of variability accounted for by our explanatory variable.
What is the coefficient of determination. r^2
200
An r value of -.98 tells us these 2 things about it's correlation.
What are negative and strong?
200
This is the reason we would be less confident making predictions about the response variable at an x-value of 40.
What is we extrapolated?
200
This 2015 disney movie looks into the emotions in a 12 year old girl's head as she deals with a life changing move. Some of the emotions include joy, sadness and anger.
What is Inside Out?
200
What condition for inference has been violated?
Unequal SD/Variance of residuals
300
When does the y intercept have no logical interpretation?
When the x variable does not take values close to 0.
300
Write out the Least-Squares Regression Line for this set from this computer output.
y-hat = 5.054+.2715x
300
What would happen to the slope and correlation coefficient if point A was removed?
Slope would increase and r would increase
300
This 2018 movie kills off a majority of its heroes. Some of the X-Force members killed off include zeitgeist, shatterstar, vanisher and Peter.
What is Deadpool 2?
300
12 students were surveyed about their # of hours studied (x), and final exam score (y). Calculate a 95% confidence interval based on this computer output.
2.697 +/- (2.228)(0.745)
(1.037,4.357)
400
12 students were surveyed about their # of hours studied (x), and final exam score (y). Interpret the slope of the LSRL.
For each additional hour spent studying, the expected score on the final increases by about 2.697.
400
We found the LSRL for this scatterplot is y=-216+5.4x.
We found a student with a height of 70 and a weight of 195. Find the residual for this value.
What is 33?
400
r = .9 xbar = 10 ybar = 140 sx = 1.5 sy = 9
Calculate the equation of the LSRL.
yhat = 86 + 5.4x
400
This 2022 Nic Cage movie gave the actor his biggest challenge to date: acting as himself.
What is the Unbearable Weight of Massive Talent?
400
Calculate the test statistic if testing to see if there is a positive association between mass and resting metabolic rate.
22.563/6.36 = 3.548