EXTRA CREDIT FOR FINAL EXAM Flashcards
What does Variability do?
Makes it easier to detect differences in the treatment outcomes.
Practice Problem A study found correlation r=0.61 between the sex of a worker and his or her income. You conclude that
A. Women earn more than men on the average.
B. Women earn less than men on average.
C. An arithmetic mistake was made; this is not a possible value of r.
D. This is nonsense because r makes no sense here.
D. This is nonsense because r makes no sense here.
Block
group of experimental units or subjects that are similar in ways that are expected to affect the response to the treatments
What is the explanatory variable in the LSRL formula?
x
What is the general equation for a least square regression line
ŷ=a+bx
Controls allows ______?
The experimenter to eliminate confounding effects of lurking variables.
What is a Matched Pairs Design?
A type of block design used when an experiment only has two treatments and participants can be grouped into pairs based on a variable. Within these pairs, participants are randomly assigned to treatments.
What is a two way table?
IDK, There is a row, column. Add all the number of column and row will give the total amount of the study.
What are the four types of quantitative graphs covered in class?
Stem Plot
Histogram
Dot Plot
Ogive
What are the possible measures of spread?
Range
IQR
Variance
Standard Deviation
If a player rolls two dice and gets a sum of 2 or 12 he wins $20. If the person gets a 7 he wins $5. The cost to play the game is $3. Find the expectation of the game.
Expectation=the meanE(x)= 1.165
Define simulation
The imitation of chance behavior based on a model that reflects the experiment.
What is a Convenience Sample?
A poor sampling technique in which the data is obtained in the most convenient way possible, which will not account for any lurking variables in the sample. EX: A teacher asking only the students who will be in his room during the day.
What type of graph is this?
continuous density curve
What is the 5th and final step in designing a simulation?
State your conclusions
Where is b found in a computer printout?
Directly below a
What is IQR?
What is its equation?
When do you find the IQR for spread?
- Inner Quartile Range
- Q3-Q1=IQR
- You use it when the shape of the graph is skewed
Placebo effect
Dummy treatment that has no physical effect
Comparative Experiment
Treatment–ObservationObservation 1–Treatment–Observation 2
Independence
Is P(A) × P(B) = P(A and B)?Is P(B|A) = P(B)?Is P(A|B) = P(A)?If yes then the events are independent.
What type of graph is this?
discrete density curve
What does “ŷ” mean?
Predicted value/outcome
What is the z-score equation?
z = (x - μ) / σx = x-valueμ = meanσ = standard deviation
What is an example of under coverage?
Sample Houses, prisoners or students