A Student Adds 0

question 88

Multiple Choice

A student adds 0.250 L of 200 mM buffer stock solution to a volumetric flask and dilutes the stock to 2.0 L.What is the final concentration of the solution?

• A) 0.22 mM
• B) 220 mM
• C) 22 mM
• D) 25 mM
• E) 2.5 mM

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Definitions:

Degrees Of Freedom

A statistical concept representing the number of independent values or quantities that can vary in the calculation of a statistic, critical in estimating population parameters.

Pooled Variance

A method used in statistics to estimate the variance of two or more populations when the assumption of equal variances is reasonable.

Sample Variances

The measure of variance calculated from a sample of a population, used to estimate the population variance.

Observational

Pertains to a research method in which behavior is observed and recorded without manipulating any variables.