The Researcher's Null Hypothesis Is H₀: σ² = 420

question 43

Multiple Choice

The researcher's null hypothesis is H₀: σ² = 420. A sample of n = 18 items yields a sample variance of s² = 512. The critical values of chi-square for a two-tailed test at α = .05 are:

• A)8.672 and 27.59
• B)7.564 and 30.19
• C)-1.960 and +1.960
• D)9.390 and 28.87

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