Clash 4: Chapters 12-15 Flashcards
(17 cards)
Which hypothesis do we directly test in an experiment?
the null hypothesis
Provide an example of a directional hypothesis
Women will score higher on manual dexterity than men
How does the variability in the dependent variable affect our ability to reject the hull hypothesis?
variability decreases power
If you accept the null hypothesis when it is false, you have committed a
Type 2 error
How large is each critical region for a two-tailed test at the .01 level?
.005
Which measure of central tendency is the middle score of a distribution?
Median
When are the mean, median, and mode the sale value?
Normal Curve
Which measure of central tendency is not always applicable to a distribution?
Mode
The quickest method of determining which set of numbers had the greatest variability
The range
When do we reject the null hypothesis in a chi square test?
x2 obtained is greater than x2 critical
What does p
the obtained value could occur by chance less than 5% of the time
Explain what the critical value of t means?
the value of t you must exceed to reject the null hypothesis.
What three things do you need to find the critical value of t?
DF, number of tails, and alpha
Conceptually, what comprises the numerator of a t test?
the difference between two means
Conceptually, what comprises the denominator of a t test?
group variance and the number of subjects
Compare the degrees of freedom for a matched-groups t test and an independent groups t test?
The matched groups t test has half the DF
What can a matched-group t test be ore powerful than an independent-groups t test?
it can reduce variability due to individual differences
