IV & DV and Direction
As students attend more SI sessions, their GPA increases.
IV: SI sessions
DV: GPA
Direction/Relationship: Positive
What is the Probability Formula?
probability of A = # of outcomes of A/total # of possible outcomes
Z-score formula
z= X-Mu/Sigma
True or False
Hypothesis testing is a procedure that allows researchers to use populations to draw inferences about the sample of interest.
False, Hypothesis testing is a procedure that allows researchers to use samples to draw inferences about the population of interest.
What is your SI Leader's name?
Vincent Dang
The less you sleep the night before an exam, the lower your test score.
IV: Hours of Sleep
DV: Test Score
Direction/Relationship: Positive
True or False
Probabilities/proportions are NOT ALWAYS Positive
False, they are ALWAYS positive
Sum of Squares Formula
SS =SigmaX2 - (SigmaX)2/n
What are these two opposing hypotheses?
1. No change, no difference, no relationship
- H0
2. There is change, is a difference, relationship is there
- H1
1. Null hypothesis, there's no effect of IV on DV
2. Alternative hypothesis, IV has effect on DV
What is your SI Leader majoring in?
Psychology
Psychologists wonder about the relationship between the intake of alcohol and emotional reactions to frightening stimuli. (IV and DV only)
IV: Intake of alcohol
DV: Emotional reactions
Suppose you are rolling a die, what is the probability of rolling a 1 or an even number?
p(rolling a 1 or even number) = 4/6 = 2/3
Pearson's Correlation Formula
r = SP/Sq.Rt (SSxSSy)
The sample of participants comes from the population with average stress scores. μ = 60
State/Notate the hypotheses
H0: μ = 60
H1: μ ≠ 60
What is your SI Leader's email?
vdang10@csudh.edu
*Same Example*
As more people intake more alcohol, emotional reactions to frightening stimuli decreases. What is the direction/relationship?
Negative
In a complete deck of cards (52):
- 4 suits (hearts, diamonds, clubs, spades)
-13 cards per suit (3 of which are Face Cards- King, Queen, Jack)
What is the probability of selecting a Diamond?
13/52
SP = Sigma (X-Mx)(Y-My)
(hint: Pearson's Correlation/r)
Definitional Formula
Errors In Hypothesis Testing
If you reject the Null Hypothesis, and the treatment has no effect, what type of Error would this be?
Type I Error
When are SI sessions for this course held? (dates & times)
Tuesdays (1PM - 2:15pm)
Thursdays (10AM - 11:15AM)
In a study, psychologists found that being more polite to people tends to make them more cooperative.
IV: Being Polite/Politeness
DV: Cooperation
Direction: Positive
In a complete deck of cards (52):
- 4 suits (hearts, diamonds, clubs, spades)
-13 cards per suit (3 of which are Face Cards- King, Queen, Jack)
What is the probability of selecting an Ace OR Heart?
17/52
Cohen's d (effect size)
mean difference/standard deviation
If the Null Hypothesis is rejected, would the results be statistically significant or not statistically significant?
Statistically significant
A service that the TLTC provides.
SI Program
Tutoring Services (Group Tutoring/One on One/Study Hall)
Net Tutor Tutoring