Which of the following is false?

a. A chi-square distribution with k degrees of freedom is more rightskewed than a chi-square distribution with k+1 degrees of freedom.

b. A chi-square distribution never takes negative values.

c. The degrees of freedom for a chi-square test are determined by the sample size.

d. P(χ² > 10) is greater when df = k + 1 than when df = k.

e. The area under a chi-square density curve is always equal to 1.

Select the best answer.