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Understanding Pearson Correlation Coefficient

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Understanding Pearson Correlation Coefficient

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Questions and Answers

What is the formula for the regression equation?

$Y = aX^2 + bX + c$

$Y' = aX^2 + bX$

$Y' = a + bX$ (correct)

$Y = mx + c$

What does the sum of residuals represent in regression analysis?

Intercept value

Predicted scores

Deviations from the regression line (correct)

Actual points

What assumption is necessary for correlation analysis?

Data spread around the mean

Normality of underlying data (correct)

Non-linear relationship between variables

Equal variances of data sets

What is the relationship between regression analysis and correlation?

The slope of the regression line is related to the r-value in correlation Signup and view all the answers

What does the regression line aim to minimize?

$\text{Sum of squared errors}$ Signup and view all the answers

What is a key advantage of non-parametric tests?

They do not require assumptions about the underlying distribution Signup and view all the answers

What is the main drawback of non-parametric tests compared to parametric tests?

They tend to be less powerful and have a greater chance of type II error Signup and view all the answers

What is the purpose of bootstrapping techniques in statistics?

To create multiple alternate sets of data for comparison with the observed set Signup and view all the answers

What statistical measures are used to know about the distribution of values?

Mean and standard deviation Signup and view all the answers

What does the standard error of the mean represent in statistics?

The precision of the sample mean as an estimate of the population mean Signup and view all the answers