Happiness and development might not go hand in hand. One of the more popular measures of subjective well-being, or life satisfaction, is the Cantril Ladder, where satisfaction is rated on a scale of 0 and 10 and higher values mean higher satisfaction. The file Wellbeing contains mean results of a random sample of 54 countries, grouped according to their development level (low, moderate, high) as set by the Human Development Index.

a. Is there evidence of a significant difference in the variances of the mean wellbeing for the three development levels? (Use α=0.05.)

b. At the 0.05 level of significance, is there evidence of a difference among mean wellbeing for the three development levels?

c. If appropriate, use the Tukey-Kramer procedure to determine which development levels significantly differ with respect to mean wellbeing. (Use α=0.05.)

d. What can you conclude about the effect of development level on wellbeing?