What test?
Does mean wing length differ between 3 species of bees?
ANOVA
Does mean reaction time differ between deer in habitats closer or farther away from cities?
Independent/Two sample t-test
What variables are measured?
Two numerical continuous variables
Goal of this test?
Fit a line to data to predict values of the dependent variables based on values of the independent variable
What do the X and Y axes represent?
X = what you know/measure
Y = what you predict
Can test performance be predicted from GPA?
Linear regression
Is there an association between what state someone is from and what drink they prefer?
X2 contingency test
What does the r value represent?
The measure of strength (scatter) and direction (sign) of the relationship
What is the equation used? What does each variable stand for?
Y = a + bX
b = slope
a = y intercept
How do you test for equal variance of X values?
Residuals - difference between observed and predicted value
Is there a relationship between height and weight of dogs?
Correlation
Is the proportion of individuals of SU students from different states equal?
X2 goodness of fit
What does it mean if r is +/-? What does it mean if r is closer to or farther from 1?
Positive vs. negative correlation
Degree of correlation, how close scattered it is
What does the R2 value represent?
The amount of variance in Y explained by the regression line
The null is predicting the slope is what value?
The slope (b) = 0
Does mean body temperature differ from the average body temp (98.6 F)
One sample t-test
Is the proportion of individuals who open the door with their left hand equal to those who open with their right hand?
Binomial
What are the assumptions of the test?
Continuous variables
Random sample
Separately X and Y are normally distributed
Together X and Y have a bivariate normal distribution
What are the assumptions of this test?
Random sample
Y is normally distributed with equal variance for all values of X
Relationship between Y and X is linear
How can you use the equation of the line to predict values?
Plug in value into X to predict Y value
Does mean body weight of students differ before and after freshman year?
Paired t-test
Comparing the mean diameter of sand dollars at four different beaches on the west coast
ANOVA
What test should you use if assumptions are not met?
Spearman's Rank Test
What to do if data does not meet assumptions?
Report regression results with & without outlier
Transform the data
What is an error when plugging in values into an equation?
Don't predict values outside of data set!