Find the Critical Value or Values Of $\chi ^ { 2 }$

question 12

Essay

Find the critical value or values of $\chi ^ { 2 }$ based on the given information.
-With individual lines at the checkouts, a store manager finds that the standard deviation for the waiting times
on Monday mornings is 5.7 minutes. After switching to a single waiting line, he finds that for a random sample
of 29 customers, the waiting times have a standard deviation of 4.9 minutes. Use a 0.025 significance level to test
the claim that with a single line, waiting times vary less than with individual lines.

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Definitions:

Aggressive Behavior

Actions or conduct that is forceful, hostile, or attacking.

Independent Variable

The variable that is manipulated or changed in an experiment to observe its effect on the dependent variable.

Dependent Variable

A variable in an experiment or model that is expected to change in response to changes in independent variable(s).