Exam II Review Flashcards
When do you reject the null hypothesis?
When p < a
What does it mean when a result is statistically significant?
The result is not likely to be due to chance
What does the p-value actually mean?
The probability of observing a value more extreme (more greater than, less than, or equal to) than the observed value when compared to null hypothesis
When do you use the z-test?
When you know the population variance
When do you use one sided values in t-tables?
If the alternate hypothesis is <> null
What do confidence intervals say about probability?
Nothing
What conclusion can you draw from a confidence interval?
The likelihood that a population parameter lies within this range of values is (confidence level)
What does a confidence interval say about other samples?
Nothing
Where do you find critical values?
On the table
Single blinded study
Only researchers know who is in a control
What do matched pairs measures?
Differences between a pair of similar subjects
What’s the “sample” and what’s the “mean” for a matched pair?
Sample: differences; mean: 0
Test statistic definition
Numeric measure of distance from sample value to Null Hypothesis
What does a higher number of degrees of freedom indicate about normality?
More degrees of freedom = closer to normal
Matched pairs experiment design
Each unit receives two treatments
