Homoscedasticity Study guides, Class notes & Summaries

EPPP Questions Research and Statistics with Complete Solutions R squared is the: a. coefficient of multiple determination b. coefficient of stability c. coefficient of internal consistency d. silver character on "Star Wars" a. coefficient of multiple determination When data points are widely scattered around a regression line, this indicates: a. low homoscedasticity b. low correlation coefficient c. low heteroscedasticity d. high heteroscedasticity b. low correlation coeffic...

WGU C207 Pre- Assessment Data-Driven Decision-Making Exam (NEW 2023/ 2024 Update) Questions and Verified Answers- 100% Correct| Grade A A company decides to auction excess inventory on an auction website. The company has performed a regression analysis to identify how the length of the auction impacts the final price. Which statistic indicates the strength of the relation ship between the length of the auction and final price? F-statistic P-value R-squared Z-score Answer: R-squared...

EPPP Questions Research and Statistics correctly answered 2023(updated)EPPP Questions Research and Statistics correctly answered 2023 R squared is the: a. coefficient of multiple determination b. coefficient of stability c. coefficient of internal consistency d. silver character on "Star Wars" - correct answer a. coefficient of multiple determination When data points are widely scattered around a regression line, this indicates: a. low homoscedasticity b. low correlation coeffici...

R squared is the: a. coefficient of multiple determination b. coefficient of stability c. coefficient of internal consistency d. silver character on "Star Wars" correct answer a. coefficient of multiple determination When data points are widely scattered around a regression line, this indicates: a. low homoscedasticity b. low correlation coefficient c. low heteroscedasticity d. high heteroscedasticity correct answer b. low correlation coefficient Heteroscedasticity correct answer...

Cramer V Test - Used to indicate how strongly associated two different categorical/nominal variables are with each other. - Based on Pearson Chi-Square statistic - Test is performed on contingency tables - Cramer's V value is between 0 & 1. - Values closer to 0 indicate little association between variables. - Values closer to 1 indicated strong association between variables. - In 2x2 contingency table, Cramer's V = Phi coefficient - Can be used on tables with size > 2x2 (i.e. 3x3, 3...

Now that we've been open for 15 weeks, we want to compare the average weekly sales on Saturday to the average weekly sales on Sunday. Which is the appropriate statistical test? - Answer- t-test We perform a t-test and our p-value is less than 0.05. Should we reject the null? - Answer- Yes. We have a significant difference between the groups. Which statistical test can we use to test a correlation between customers per day and sales per day? - Answer- Linear Regression Which R-square gi...

Now that we've been open for 15 weeks, we want to compare the average weekly sales on Saturday to the average weekly sales on Sunday. Which is the appropriate statistical test? - Answer- t-test We perform a t-test and our p-value is less than 0.05. Should we reject the null? - Answer- Yes. We have a significant difference between the groups. Which statistical test can we use to test a correlation between customers per day and sales per day? - Answer- Linear Regression Which R-square gi...

ANOVA variables and level of measurments Correct Answer IV is categorical or nominal (with 3 or more levels) DV is parametric data Correlation Correct Answer examining relationship between two variables looks at pearsons R coefficient, (Scatter plots are appropriate representation for correlation) (Looks at linear relationships) Problems with covariance Correct Answer Problems with a particular statistical method; - Depends on the unit of measurement (eg. Miles converted to Km gives a d...

EPPP RESEARCH AND STATISTICS EXAM QUESTIONS WITH COMPLETE ANSWERS Regression Equation - Answer--Used to predict the value of a Y variable on the basis of a person's score on an X variable -based on the assumption that the relationship between X and Y can be depicted as a straight line -The variability of y scores is equal throughout the range of X scores )(homoscedasticity) -One can predict Y on the basis of scores on X A study designed to identify problem-solving skills among violent ...

trend -is a general direction in which something is developing or changing analysis of variance (ANOVA) -verifies if multiple populations of data are the same or at least one is different than the others. cyclicality -describes results that go up and down periodically, but don't necessarily follow the calendar homoscedasticity -assumes that the variance of a dependent variable is consistent across the range of values