Interpretation
What is the predicted happiness for a person who 3 scoops of ice cream and 1 hour of exercise
Happiness'= 0.23icecream + 0.2exercise
ice cream in scoops, exercise in hours
What is 0.89
Ellie wants to know if there is a difference between river central students and quad students in their intelligence. (Intelligence is a continuous variable). What test should she use?
What is an independent-samples t-test
What two things does the correlation coefficient tell you about the relation between the two variables?
What are direction and strength?
What test should you run if you fail the assumption checks for the Independent samples t test?
What is the Mann-Whitney U-test (Wilcoxon Rank Sum Test)?
Name one tool that is used to check normality
What is a QQ plot or histogram
Look at the following equation:
Health' = 0.3 + 0.2exercise
What is the the predictor variable?
What is exercise?
Katie wants to know if test scores differ under loss averse versus non-lose averse situations. Her participants take a test with loss averse phrasing on one and non-loss averse phrasing on the over. Every participant will experience both conditions and the order of the two is counterbalanced. What test should she use?
What is "paired t-test"
Ellie runs a correlation on her data. Her r^2 ends up being 0.55. How should Ellie interpret this?
What is "55% of variation in x is explained by y (and vice versa)"
A t-test is conducted to look at the differences in dog and cat owners love of nature. Dog owners had a mean of 9.73 and cat owners had a mean of 8.5. The 95% confidence interval was [-0.32, 1.5]. Do we reject or fail to reject the null hypothesis?
What is fail to reject the null hypothesis
GPA' = 0.02sleep -0.05athlete + 3
Above is an equation predicting GPA. For athlete, 0=not a varsity athlete and 1= a varsity athlete. In this case, athlete is a ______ variable?
What is a dummy ?
Ellie got her test statistics F(2, 57) = 3.28, p < .0001, R-squared = 0.7253, Adjusted R-squared = 0.7246. How should Ellie interpret the results?
The predictors together explain 72.46% of the variance in the outcome variable.
A teacher goes around the science to collect the GPA of students. After collecting the data, the teacher saw that on average, the GPA was a 3.4, SD = 1.2. According to the Harvard database, students have an average of a 3.2 GPA. What test should this teacher run to compare the students in the science center to the entire Harvard population?
What is "one-sample t-test"?
True or False: Standardized coefficients can be viewed as “effect sizes” for regressions
What is true?
Ellie wants to know if there is a difference between river central students and quad students in their intelligence. (Intelligence is a continuous variable). What should be her alternative hypothesis?
What is "The river central and quad students are different in their intelligence."
What term means "the property of having equal statistical variances?"
What is homoscedasticity?
Interpret the regression coefficient for ice cream.
Happiness'= 0.23icecream + 0.2exercise
ice cream in scoops, exercise in hours
What is "Controlling for exercise, every one scoop increase in ice cream is associated with on average 0.23 point increase in happiness."
A psychology student wants to study college scholarship money. She goes to the Harvard financial aid office to collect her data. This is her proposed question: How is area of the country (NW, SE, and SW) associated with amount of scholarship money recieved? What type of test should she run?
What is ANOVA?
Which of the following correlation coefficients is stronger: -0.82 or 0.31
What is "-0.82"
What piece of information determine whether you run a z-test or one-sample t-test?
What is the population standard deviation?
Why are nonparametric tests always used if they have fewer assumptions?
What is "because they have lower power compared to their parametric equivalent?"
Which of the following predictor variables has a greater effect size?
sleep' = 0.51 + 0.3exercise - 0.13job
What is exercise?
Sally's mom has been telling her that she should exercise more lately. However, Sally says that it will interfere with her school work. Her mom disagrees and says that it will actually help her GPA. Sally then decides to research if there is a connection between the amount of exercise per week and a persons GPA. What test should she run?
What is a correlation/regression?
What test should you run if you fail the Pearson correlation assumptions?
What is "Spearman Rho and Kendall’s Tau?"
What test would you run if you wanted the find the difference between means of twins?
What is paired t-test?
What is the fifth assumption for regression?
1. On average, they add up to zero
2. normality
3. additional check for linearity
4. Homoscedasticity
What is "no auto-correlation?"