Question 1: Suppose you are given the following age data from a sample. Calculate each of the requested values and answer the following questions.

Age	Probability of Inclusion ()	Weight (w) (from part a)
24	0.25
29	0.25
41	0.15
35	0.35
42	0.15

a) Calculate the weight of each value in column (a).

b) Calculate the expected weighted and unweighted mean age of participants.

c) Compare and contrast your findings. If you used the unweighted value, do you think the estimate would be unbiased? Justify your answer.

d) Based on the weights that you calculated in (a) what age groups are less prevalent in the target population. Justify your claim.