10. An aviation researcher compared the job-related mental health, or well-being, of flight attendants from four different airlines: Delta, United, JetBlue, and Southwest. Flight attendants' mental health was measured using the self-administered Positive Mental Health (PMH) instrument, which is a 25-item, 6-point Likert-type response scale. Thus, scores could range from 25 to 150, with higher scores reflecting higher job-related well-being. The results of a single-factor ANOVA were as follows: R = .32, F(3,32) = 5.10, and p = .0053. Based on these results, what can we conclude about the sample?

a. The overall sample size was N = 36 and each group was of equal size.

b. The overall sample size was N = 36 and each group was of unequal size.

c. The overall sample size was N = 36, but there is not enough information to deter- mine the size of each group.

d. The overall sample size was N = 35, but there is not enough information to deter- mine the size of each group.