Solve the Problem $\chi ^ { 2 }$ Values Can Be Approximated as Follows

Solve the problem.
-For large numbers of degrees of freedom, the critical $\chi ^ { 2 }$ values can be approximated as follows:
$$\chi ^ { 2 } = \frac { 1 } { 2 } ( z + \sqrt { 2 k - 1 } ) ^ { 2 }$$
where $\mathrm { k }$ is the number of degrees of freedom and $\mathrm { z }$ is the critical value. To find the lower critical value, the negat z-value is used, to find the upper critical value, the positive z-value is used. Use this approximation to estimate the critical value of $\chi ^ { 2 }$ in a right-tailed hypothesis test with $\mathrm { n } = 125$ and $\alpha = 0.01$ .

A) $\chi ^ { 2 } \approx 167.285$
B) $\chi ^ { 2 } \approx 163.981$
C) $\chi ^ { 2 } \approx 168.448$
D) $\chi ^ { 2 } \approx 162.833$

Correct Answer:

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