Basics
What are the definitions of mean, median, and mode?
Mean- The average of a data set. Calculated by adding all of the values and dividing by how many there are.
Median- The value in the middle of a data set when placed in order from lowest to highest.
Mode- Most repeated value in a data set
When we want to reject a null hypothesis, we compare our p-values to ___.
What is .05.
If you are testing participants in a within- subjects design, you use a ____.
Dependent Means t- test
A confidence interval for a dependent means t-test gives a range of plausible values of a ____ mean difference.
Population
Nominal measurement (Qualitative)
Ordinal measurement (Quantitative*)
Interval measurement (Quantitative)
Ratio measurement (Quantitative)
In APA format, how many decimal points do we round a p-value to (if it comes from SPSS).
Three decimal places
You conduct a z- test when you are given ___.
The population variance
How do you interpret a 95% confidence interval of:
CI = [1.45, 8.31]
from a dependent means t- test.
We are 95% confident that the true population mean of the difference is between 1.45 and 8.31 units.
True or false, a dependent variable is the variable manipulated by the researchers to look for an effect on the independent variable.
What is false
In the following APA format, the 58 represents the ___.
t(58)= 1.49
Degrees of Freedom
A major difference between a z- test and a t- test is that ____ is changed due to ____.
Hint: Tables
A major difference between a z- test and a t- test is that the shape of the graph/ critical values is changed due to degrees of freedom.
The equation to calculate confidence intervals by hand is ___ for the lower limit and ___ for the upper limit.
LL: (Sample Mean)- | ta | (Sm)
UL: (Sample Mean)+ | ta | (Sm)
When the mean is greater than the median, a graph is often skewed ____.
What is to the right or positive?
In an ANOVA test written out as
4 x 4 x 4
There are ___ independent variables in the experiment and ___ levels for each IV.
What is
3 independent variables and 4 levels for each IV.
If you have multiple levels in an experiment to compare, with two independent variables, you would conduct a ___ test.
Two-Way Anova
True or false, a Cohen's d can have a 95% confidence interval?
What is true
What is the difference between a Type 1 and Type 2 error?
Type 1- The Null Hypothesis is incorrectly rejected.
Type 2- The Null Hypothesis is incorrectly not rejected.
What is incorrect in the following APA statement:
Based on the sample data, we fail to reject the null hypothesis. The ratings of the male superheroes (M = 50.03, SD = 23.01) are not significantly different than the rating of female superheroes (M = 23.23, SD = 15.09), t(31) = 5.64, p=.001, d = 1.01, 95% CI = [15.85, 33.83].
Based on the p- value and confidence interval, we should reject the null.
If any of your comparisons in an ANOVA test are found to be significant, you would then complete a ___.
What is a Post- hoc analysis.
Do you have evidence as to why a null hypothesis in this course would not be rejected based on a 95% confidence interval of
[-1.56, 2.54]
Since the value of 0 is a plausible value in the confidence interval, the null hypothesis may be a possible value so would not be rejected.