In a survey sponsored by the National Science Foundation, some of the individuals contacted for survey interviews were offered incentives, ranging from $10 to $30, for their cooperation. The table below shows the incentive levels and the fnal status of the interviews for 229 people in the study

a. Convert the table to a joint probability table.
b. What percentage of the individuals contacted for the survey completed the interview?
c. If an individual was offered a $10 incentive, how likely is it that that he/she refused the interview?
d. If an individual was offered a $30 incentive, how likely is it that he/she completed the interview?
e. Compare your answers in parts b and d, and comment on the implications. Is the level of cooperation independent of the incentive level?

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Level of Cooperation Interview Interview Not Refused, Completed Refused Not Completed S0 17 16 17 18 29 3S10 16 18 29 S20 25 드 S30