Chi-Square Distribution This chapter presented different methods involving application of the chi-square distribution. Which of the following properties of a chi-square distribution are true?

a. Values of a chi-square test statistic are always positive or zero, but never negative.

b. A chi-square distribution is symmetric.

c. There is a different chi-square distribution for each number of degrees of freedom.

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x2 5 g sO 2 Ed2 E

Review Exercises 629

d. When using a chi-square distribution, the number of degrees of freedom is always the sample size minus 1.

e. When using the chi-square distribution, sample data need not be random if the sample size is very large.