Answered: Correlation Results Correlation coeff,…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Correlation Results
Correlation coeff, r:	0.979882
Critical r:	±0.2680855
P-value (two tailed):	0.000

Fifty-four

wild bears were anesthetized, and then their weights and chest sizes were measured and listed in a data set. Results are shown in the accompanying display. Is there sufficient evidence to support the claim that there is a linear correlation between the weights of bears and their chest sizes? When measuring an anesthetized bear, is it easier to measure chest size than weight? If so, does it appear that a measured chest size can be used to predict the weight? Use a significance level of

α=0.05.

Determine the null and alternative hypotheses.

Identify the correlation coefficient, r.

Identify the critical value(s).

(Round to three decimal places as needed.)

There are two critical values at

r= ±.

There is one critical value at

Is there sufficient evidence to support the claim that there is a linear correlation between the weights of bears and their chest sizes? Choose the correct answer below and, if necessary, fill in the answer box within your choice.

(Round to three decimal places as needed.)

Yes, because the test statistic
falls between the critical values.

No, because the absolute value of the test statistic
exceeds the critical value.

Yes, because the absolute value of the test statistic
exceeds the critical value.

No, because the test statistic
falls between the critical values.

The answer cannot be determined from the given information.

When measuring an anesthetized bear, is it easier to measure chest size than weight? If so, does it appear that a measured chest size can be used to predict the weight?

Yes, it is easier to measure a chest size than a weight because measuring weight would require lifting the bear onto the scale. The chest size could be used to predict weight because there is a linear correlation between the two.

No, it is easier to measure weight than chest size because the chest is not a flat surface.

Yes, it is easier to measure a chest size than a weight because measuring weight would require lifting the bear onto the scale. The chest size could not be used to predict weight because there is not a linear correlation between the two.

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