9. A researcher collected BMI (Body Mass Index) of 50 students in an Engineering
ID: 3334916 • Letter: 9
Question
9. A researcher collected BMI (Body Mass Index) of 50 students in an Engineering school. He found the mean BMI was much smaller than the median BMI. The reason for this might be a. Several students had much larger BMI scores than the rest b. Several students had much smaller BMI scores than the other students c. The researcher made some measurement errors d. All the students had smaller BMI scores, compared to national average 10. A large batch of several million coins was recovered from an excavation site. Students who participated in the operation want to test whether the coind are unbiased (i.e. equal likely to show head or tail when tossed). They conducted 2 experiemnts: Exp-1: 100 coins were randomly selected from the batch, and then each was tossed once. Exp-2: one coin was randomly selected from the batch, and then tossed 100 times. Specifically, the question they are interested is that If every coin in the batch could be tested for unbiasedness, they would be able to know whether these coins are unbiased. Select all the answers that is false a. Since each eperiement has a sample size 100, they can answer the the question b. Since the coins were randomly selected from the batch, they can answer the question c. Both data sets contain the same information to answer any question about the d. The data from Exp-1 can answer the question better that Exp-2 equally well. eqally wel. unbiasedness of the coins.Explanation / Answer
9. A distribution that is skewed to the left (bunched up toward the right with a "tail" stretching toward the left) typically has a mean smaller than its median
Hence answer here is b. Several students had much smaller BMI scores than the other students.
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