Exam 3 Study Flashcards
What is an explanatory variable?
That which we are changing or that the question depends upon
What is the response variable
the result being measured
What is the r2?
The coefficient of determination
what is the definition for r2?
the percent of variability accounted for in our model
can causation be determined by statistics?
NO!!!
what is the standard deviation rule
68% within 1 std deviation
95% within 2 std deviations
99.7% within 3 std deviations
What is the range for probability?
between 0 and 1
what is the range for the correlational coefficient?
r must be between -1 and +1
What is Probability Pr?
long term regularity of random behavior
what is the law of large numbers?
a large # of independent probabilities or events become more stable over long periods of time or large samples
What is emperical?
Most accurate scientific guess based on result of experients to collect data
what are subjective / personal probabilities?
what we believe something will be
gut feeling or hunch
What are the 2 characteristics of a probability model?
- Valid (between 0 and 1)
2. Must sum to 1
which variable goes on the x axis?
the explanatory variable
which variable goes on the y axis?
the dependent/response variable
