FF2613 - Correlation & Regression

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Correlation & Regression Practical

Please type in your Matriculation Number. *

e.g. P20627

A study to identify factors that can cause small for gestational age (SGA) babies was conducted. The researcher was trying to prove whether there was any association between the mothers’ first trimester weight (WEIGHT) and the child’s birth weight (BIRTHWGT). Assume that data for both WEIGHT and BIRTHWGT were normally distributed.

1. What would be the most appropriate statistical test to test the association between the mothers’ first trimester weight and the childs’ birth weight? *

Paired t-test.

Spearman Correlation

Pearson Correlation

Wilcoxon Signed Rank Test

Wilcoxon Rank Sum Test

2. Conduct the statistical test from the above answer. What is the value of the coefficient? *

-0.4314

0.0168

0.1861

0.4314

1.8094

3. What is your conclusion based on the above test result? *

There is a fair and negative linear relationship between mothers’ weight and childs’ birth weight.

There is a fair and positive linear relationship between mothers’ weight and childs’ birth weight.

There is a weak and negative linear relationship between mothers’ weight and childs’ birth weight.

There is a weak and positive linear relationship between mothers’weight and childs’birth weight.

There is no relationship between mothers’ weight and childs’ birth weight.

4. To predict the child’s birth weight (BIRTHWGT) based on the mothers’ first trimester weight (WEIGHT), we need to be do a linear regression test. What is the value of the regression coefficient? *

-0.0168

0.0168

-0.4314

0.4314

1.8094

5. For the linear regression test, what is the value of the constant? *

0.0168

-0.4314

0.4314

-1.8094

1.8094

6. What is the equation for the linear regression test? *

y=1.8094+0.0168x

BIRTHWGT=0.0168+1.8094WEIGHT

BIRTHWGT=0.4314+1.8094WEIGHT

BIRTHWGT=1.8094+0.0168WEIGHT

BIRTHWGT=1.8094+0.4314WEIGHT

A case-control study to identify factors that can cause small for gestational age - SGA was conducted. Among the factors studied were whether there is an association between the mothers' height in cm (HEIGHT) and the child's birth weight in kilogram (BIRTHWGT). Data normally distributed. Conduct the appropriate statistical test.

7. What would be the most appropriate statistical test to test the association between the mothers' height and the childs' birth weight? *

Paired t-test.

Pearson Correlation

Spearman Correlation

Wilcoxon Rank-Sum Test

Wilcoxon Signed-Rank Test

8. What is the value of the coefficient? *

(0.035)

(-0.188)

(0.188)

(-0.441)

(0.441)

9. What is your conclusion based on the above test result? *

There is a fair and negative linear relationship between mothers' height and childs' birth weight.

There is a fair and positive linear relationship between mothers' height and childs' birth weight.

There is a weak and negative linear relationship between mothers' height and childs' birth weight.

There is a weak and positive linear relationship between mothers' height and childs' birth weight.

There is no significant relationship between mothers' weight and childs' birth weight.

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