



Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community for help and clear up your study doubts
Discover the best universities in your country according to Docsity users
Free resources
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
Exam 4 for PBSI 301 (stats) questions with verified answers graded A+
Typology: Exams
1 / 5
This page cannot be seen from the preview
Don't miss anything!
Factorial ANOVA - correct answer ✔✔an analysis of variance involving two or more independent variables or predictors. factorial notation - correct answer ✔✔A way to summarize the design of a study numerically i.e., 2x3 factorial notation = The first variable has 2 levels (i.e., male or female) and the second IV has 3 levels (age, height, weight) factor - correct answer ✔✔an independent variable Level - correct answer ✔✔the specific values that the experimenter chooses for a factor
how do identify main effects and interactions significance - correct answer ✔✔split them into sources of between or within and the p-value tells us whether or not the effect is significant or not Correlation - correct answer ✔✔how do changes in the value of one variable relate to the values of another variable correlation coefficient - correct answer ✔✔a statistical index of the relationship between two things (from -1 to +1) are a way of assigning a single number to describe these relationships- r. what does r tell us? - correct answer ✔✔1. Direction
linear equation of regression - correct answer ✔✔Y' = bx + a The line of best fit - correct answer ✔✔Minimizes the distance between each data point and the line residual - correct answer ✔✔◦ The distance between the regression line and any one person's actual Y score Or the difference between y prime and y. solving for b - correct answer ✔✔know equation solving for a - correct answer ✔✔equation, need b how to test whether the beta (b) is significant? - correct answer ✔✔no critical values, given p- values standard error of estimate - correct answer ✔✔The average size of all the residuals unstandardized regression coefficient (b) - correct answer ✔✔The change in the dependent variable associated with a 1 unit change in the independent variable when all other variables in the regression model are controlled for standardized beta coefficient - correct answer ✔✔standardization translates each independent value into the number of standard deviations away from its own mean
It is the correlation when you have just 1 predictor!!! Helpful when we want to compare effects across different types of variables. Regression vs. Correlation - correct answer ✔✔In correlation, you can only have 2 variables ◦ In regression, you can have multiple predictors of a single outcome. ◦ Allows the researcher to ask more complex (and potentially more interesting questions) interpreting beta in multiple regression - correct answer ✔✔ r2 in regression - correct answer ✔✔This is the effect size for multiple regression Interpreted as a percentage of the variance accounted for by all of the predictors together. parsimony - correct answer ✔✔The scientific method demands that we should accept the simplest answer