Biology Forums - Study Force

Use the following to answer the questions below:

Students in a small statistics course wanted to investigate if forearm length (in cm) was useful for predicting foot length (in cm). The data they collected are displayed in the provided scatterplot (with regression), and the computer output from the analysis is provided.

Use three decimal places when reporting the results from any calculations, unless otherwise specified.

The regression equation is Foot (cm) = 9.22 + 0.574 Forearm (cm)
 

Predictor	Coef	SE Coef	T	P
Constant	9.216	4.521	2.04	0.066
Forearm (cm)	0.5735	0.1578	3.63	0.004

Source	DF	SS	MS	F	P
Regression	1	44.315	44.315	13.20	0.004
Residual Error	11	36.916	3.356	​	​
Total	12	81.231	​	​	​

Predicted Values for New Observations

Forearm (cm)	Fit	SE Fit	95% CI	95% PI
28	25.274	0.513	(24.144, 26.403)	(21.086, 29.461)

Consider the scatterplot. Should we have any significant concerns about the conditions being met for using a linear model with these data?

▸ Yes

▸ No

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