Does a high value of r2 imply that two variables are causally related? Explain.

Q: Define Estimation of Dynamic Causal Effects?

A: The effect of a change in X over time on Y is a dynamic causal effect.  It is useful to think of a…

Q: Explain how causal effects can be estimated that depend on observables?

A: Causal effect means something has happened or is occurring, depending on something that has occurred…

Q: How forecasting is quite different from the estimation of causal effects.?

A: Time series data is commonly used to forecast. For example, economic growth for next year is…

Q: What are the explanatory variable and response variable for this relationship?

A: Given that among a group of 138 customers aged 14-23 who send more text messages tend to use a…

Q: What is the independent variable and dependent variable in this question

A: There are two variables Level of parenting stress Number of children (one child and two or more…

Q: Studies have shown that people who suffer sudden cardiac arrest have a better chance of survival if…

A: (a) The scatter plot is obtained using EXCEL. The software procedure is given below: Enter the…

Q: tudies have shown that people who suffer sudden cardiac arrest have a better chance of survival if a…

A: The given data is as follows:

Q: Studies have shown that people who suffer sudden cardiac arrest have a better chance of survival if…

A: Independent and dependent variables in regression: In a simple regression, the variable of interest,…

Q: When an interaction term is statistically significant, you must be cautious in interpreting the main…

A: Interactions:In ANOVA, firstly the interaction effects are found between the given variables. The…

Q: Cite three examples of two variables that are positively correlated and three bivariate data that…

A: Correlation means the relationship between two variables. There are 4 types of correlation.…

Q: Studies have shown that people who suffer sudden cardiac arrest have a better chance of survival if…

A: The accompanying data give y = survival rate (percent) and x = mean call-to-shock time (minutes) for…

Q: Studies have shown that people who suffer sudden cardiac arrest have a better chance of survival if…

A: (a) The scatterplot is constructed using Excel and the procedure is given below: Enter the data…

Q: In MANOVA, main effects and interaction are assessed on multiple dependent variables (DVs). True or…

A: MANOVA: MANOVA (one-way multivariate analysis of variance) is used to determine the significant…

Q: Explain assessing the validity of a regression model for forecasting?

A: Predictions for regression are true only for the data set used to estimate the model. The…

Q: What is Interaction and simple effects?

A: Interaction effects and main effects are commonly used in factorial experiments, ANOVA and…

Q: If the regression line is not a "good fit" what would be better to use to approximate a response…

A: The response variable is called dependent variable. If the regression line is not a good fit, then…

Q: Define the estimation of Dynamic Causal Effects with Exogenous Regressors?

A:

Q: Why is it often preferable to use more than one predictor variable in a regression analysis?

A: In a regression analysis, the presence of more number of predictor variables means that more number…

Q: Five pairs of data are used in determining a regression line ŷ = -3 + 4x. If the five values of the…

A: The regression equation is given as ŷ = –3 + 4x.

Q: What is Instrumental Variables Regression?

A: An instrumental variable (sometimes referred to as a "instrument" variable) is a third variable, Z,…

Q: How can you verify whether the linear correlation between two variables in a scatterplot is…

A: Correlation:Correlation a measure which indicates the “go-togetherness” of two data sets. It can be…

Q: In an experimental study, what makes one variable the predictor (i.e., independent) and the other…

A: The independent variable is the variable the experimenter manipulates or changes, and is assumed to…

Q: Assume we have data demonstrating a strong linear link between the amount of fertilizer applied to…

A: A variable can be divided into two types dependent and independent. The independent variables are…

Q: My previous classmate researched on the relationship between children’s nutrition and their…

A: Independent variable : The independent variable (IV) is the characteristic of a psychological…

Q: What does it mean when one of the two main effects is significant?

A: Given problem Given that   What does it mean when one of the two main effects is significant ?

Q: Define Estimation of Causal Effects?

A:

Q: Based on statistical analysis, are we justified in asserting that two variables are statistically…

A: Independent  : Two events are independent when P(A/B) =P(A) . Here P(A/B)[conditional probability of…

Q: A study found that eating breakfast has a positive correlation with success in school for elementary…

A: The strength and direction of linear relationship between two variables is measured by correlation.…

Q: It has been demonstrated that students with high self-esteem tend to have higher grades than…

A:

Q: Explain why the predictor variable is useless as a predictor of the response variable if the slope…

A:

Q: Does a high value of r2 allow us to conclude that two variables are causally related? Explain.

A: high value of r2 doesn't allow us to conclude that two variables are causally related. Two variable…

Q: Similarly show that the F-statistic for the interaction is the square of the t-statistic for the…

A:

Q: If the regression line is not a "good fit" what would be better to use to approximate a response…

A: Mean is a measure of central tendency of a set of observations.

Q: A high correlation between two variables does not always mean that changes in one cause changes in…

A: Correlation,  is a statistic that measures the degree to which two securities move in relation to…

Q: If the omitted variable is negatively correlated with the treatment and has a positive impact on the…

A: If the increase in one variable tends to decrease the second variable under consideration, there…

Q: What do we assume our Level of Significance to be unless otherwise specified?

A: Significance level ( alpha ) :  The significance level, also denoted as alpha or α, is a measure of…

Q: What are the Standard Errors for Fixed Effects Regression?

A:

Q: Under what circumstances could an independent variable in one study be a dependent variable in…

A: Dependent variables are those variables that get influenced by other variables in the experiment.…

Q: Suppose two variables are negatively correlated. Does the response variable increase or decrease as…

A: Suppose X and Y are two variables which are negatively correlated. Correlation (X,Y)<0

Q: Does a high value of r2 allow us to conclude that two variables are causally related? Explain. - A…

A: Given information: Comment whether high value of r2 allow us to conclude that two variables are…

Q: Correlation studies are designed to minimize other possible explanations and conclude a causal…

A: Correlation studies are designed to check the linear relationship between the variables and…

Q: How could we provide evidence for the positive association between two variables through linear…

A: Association or correlation:Association tells about the relationship between two variables. There are…

Q: Is the dependent variable is always dependent to the independent variable(s) of the study? Why?

A:

Q: Studies have shown that people who suffer sudden cardiac arrest have a better chance of survival if…

A: The regression equation is y=101.26-9.23x.

Q: In predicting the change in blood pressure for someone taking blood pressure medication, identify…

A: Answers may vary; one of the possible answers is given below:Qualitative predictor variable: The…

Q: Cite three examples of two variables that are positively and three bivariate data that are…

A:

Correlation

Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.

Linear Correlation

A correlation is used to determine the relationships between numerical and categorical variables. In other words, it is an indicator of how things are connected to one another. The correlation analysis is the study of how variables are related. 

Regression Analysis

Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as predictors. Regression analysis is one of the methods to find the trends in data. The independent variable used in Regression analysis is named Predictor variable. It offers data of an associated dependent variable regarding a particular outcome.