A Statistician Claims That the Standard Deviation of the Weights $26.2$

question 109

Multiple Choice

A statistician claims that the standard deviation of the weights of firemen is more than 25 pounds. A sample of 20 randomly chosen firemen had a standard deviation of their weights of $26.2$ pounds. Assume the variable is normally distributed. At $\alpha = 0.05$ , what is the critical value $\chi ^ { 2 }$ for this test?

• A) 10.851
• B) 10.117
• C) 31.410
• D) 30.144

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