PSYC EXAM 2
In what situation do you conduct a 2 tailed T test over a 1 tail T test?
2 tail says results can be different in two directions, is rarely used 1 tailed T test is only different in only goes 1 direction. 2 tails ex. You don't know which direction the difference goes, 1 tail says that you're sure of which direction it goes.
How many null hypothesis do I have if you are a business and psych major with male and female?
3 or 6
Generally speaking, what is the minimum number of people we are testing?
30
What % risk are social scientist generally willing to take?
5%
What do social scientists use as a confidence interval?
95%
Regarding the theory of the room temperature which one is the independent variable?
Independent variable is Temperature, dependent variable is the Student Satisfaction
What is the purpose of a multiple regression?
predicting an outcome when you have two independent variables with more than one variable(s).
What t test are you using if you're comparing pre and post test?
Independent sample t-test
What is the R value on this scatter plot if all dots are scattered and not in one line?
R value= 0.8
What is the purpose of a pivot table
See trends across different categories
When would you use a non parametric test?
When it doesn't fit a normal distribution
When would I use a median over mean
When it is anything other than a normal distribution
What is the purpose of a meta-analysis?
When you're taking the score of multiple studies and try to integrate them together
What does a statistically significant finding on an ANOVA tell you?
An anova will tell you the deviation
What is a parametric assumption?
Assumptions based on parameter assumption
Why can a correlation not be greater than 1.0?
Because you can't be more than 100% confident
When would you use a goodness of fit chi square test?
Categorical
What is the inferential between an inferential and descriptive statistic?
Descriptive statistics uses the data to provide descriptions of the population, either through numerical calculations or graphs or tables. Inferential statistics makes inferences and predictions about a population based on a sample of data taken from the population in question.
What are two factors for variables on a factorial analysis?
Male - Female, young - old
a set of variables that would use a chi square test?
Male and Female, attendance, whatever in frequency
MANOVA
Multivariate Analysis of Variance, allows us to test hypotheses regarding the effect of one or more independent variables on two or more independent variables
How do I set up a table? What columns do I need for a goodness of fit chi square test?
Outcome, Expected, Difference (O.E.D)
Which T test do you use if you are comparing your test group to a known mean?
Single Sample
What does a correlation coefficient tell us?
Strength of a relationship between variables
What does ANOVA stand for?
analysis of variance
What is the null hypothesis using for "I believe the warmer the room temp the more satisfied the students" ?
There is no difference/relationship with room temperature and students satisfaction
The purpose of the Bonferroni test is what?
Used to find which comparison is statistically significant
When do we use an analysis of variance instead of a T test
Used when more than two group means are being compared.
What is Ancova?
Way to make sure your groups are similar enough
What is the purpose of a regression equation?
it allows you to predict an outcome