A cross-sectional survey was conducted on adults (³20 years ofage) residing in the Khairpur district in Sindh province ofPakistan. One objective of the survey was to evaluate therelationship of social economic position with under- andoverweight. The following table gives the frequency counts for thenumber of participants in socioeconomic status (low, median, high)and BMI for a random sample of 1000 participants.
Social Economic Class | Underweight | Normal | Overweight/Obese | Total |
Low | 36 | 128 | 39 | 203 |
Median | 87 | 352 | 160 | 599 |
High | 22 | 94 | 82 | 198 |
Total | 145 | 574 | 281 | 1,000 |
1) what is the probability that a randomly selected participantis both Normal (A) and falls in the Median social economic class(B)?
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2) what is th probability that a randomly selected participantis either Overweight/obese (A) or falls in the low level socialeconomic class (B)?
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3) Suppose a randomly selected participant is form the LowSocial Economic Class (A). Given this knowledge what is theprobability that this person is overweight (B).
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4) Is being overweight (A) independent of social economic class?Consider the case of whether or not a randomly selected participantfalls in the Low Social Economic Class (B) to answer thisquestion?
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