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john is analyzing the relative dispersion of two variables: GDP in dollars and average life expectancy....

john is analyzing the relative dispersion of two variables: GDP in dollars and average life expectancy. Which statistical measure should he use?

Correlation Coefficient

Coefficient of Variation

Standard Deviation

Coefficient of Determination

You are trying to decide whether to run a t-test for sample means assuming equal or unequal variances. What should you do?

Run a regular z-test and use the sample correction factor.

Run an F-test for variances to determine whether or not the variances are equal.

Assume the results will agree with the paired t-test and run that test instead.

Run an ANOVA test to determine if the variances are the same.
Math   Statistics-And-Probability   
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john is analyzing the relative dispersion of two variables: GDP in dollars and average life expectancy. Which statistical measure should he use?

relative dispersion is a techniques used Coefficient of Variation method to compare the dispersion

b) Coefficient of Variation

You are trying to decide whether to run a t-test for sample means assuming equal or unequal variances. What should you do?

Task is to run the F test and determine the further process

b) Run an F-test for variances to determine whether or not the variances are equal.

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