Chapter 8
What are the learning objectives for Chapter 8?
L O 8.1: Estimate and interpret regression models withinteraction variables.
L O 8.2: Estimate and interpret nonlinear regression models.
L O 8.3: Use cross-validation techniques to evaluateregression models.
What is a standard deviation?
How spread out data is over the mean.
What is the normal distribution? Can you draw it?
Bell Curve
Why do we use R studio?
Built for statistics. Good skill to learn coding. Excel can have problems.
How old is Nick?
23
Difference between Linear and Quadratic Formulas?
Two vs multiple varibles/different graphs
What is standard erorr?
How varied a sample mean would be from the population?
Why is the mean not a good method of analysis.
Can be deceptive, varies greatly with different data sets, doesn't tell you much about the data as a whole.
How do you import excel data into R-studio? (Step by step list)
-File
-Import data set
-Find Data
-Select sheet
-Change the name of the data
Where did Nick serve and LDS mission?
Correct Answer:
Arizona/Ethiopia/Kenya
Why does a linear regression model tell us?
A linear regression model shows the relationship between one dependent variable (Y) and one or more independent variables (X)
What is R2?
R-squared (R²) is a statistical measure that shows how well your regression model explains the variation in the dependent variable.
Which company hired statisticians to help improve their product, and what analysis was born out of it?
Guiness, and they created the t-test
List 3 R-Studio functions. And their function.
Lots of right answers
What is the one thing Nick is Allergic to?
Cats
Interpret the graph from chapter 8, on line 32.
What is Adjusted R2?
Adjusted R-squared is a version of R² that corrects for the number of predictors (independent variables) in your regression model.
Does correlation = causation.
No, just because two varible can change off of one another, doesn't mean they cause one another.
(Without looking) What would this code produce:
Model1 <- lm(Salary ~ GPA + MIS + Statistics, data = MIS_Stats)
summary(Model1)
Check R
What sport did Nick primarily play in High School?
Water Polo
Interpret what the variable and answer mean from line 62 in chapter 8.
They show the predicted salary off of how many statistcs classes were taken.
What is a t-statistics?
A t-statistic (or t-value) measures how many standard errors your estimated coefficient (like a regression slope) is away from zero.
Where is the best place to look for answers to previous content questions. (2 answers required)
Slides, R-Code, Ask Professor Miller or Myself
Do you need to know how to write your own code at the end of this course?
No, but we want you to be comfortable with and know how to change the code.
How far did Nick jump in middle school during the long jump event
11 feet