Which of the following statements defines the 75th percentile value for a data sample?
Which of the following statements defines the 75th percentile value for a data sample?
a. The value that is 75% of the largest observation in the sample.
b. The value such that 75% of the sample observations are larger than this value, and 25% of the sample observations are smaller than this value.
c. The value that is 25% larger than the sample mean
d. The value such that 25% of the sample observations are larger than this value, and 75% of the sample observations are smaller than this value.
A study concludes that the estimate risk ratio of a new drug on cataract development compared to a placebo is 0.78. This means:
a. The drug group has a 22% lower relative risk of developing cataracts compared to the placebo group.
b. The risk of the developing cataracts in drug group is smaller than the risk of the placebo group.
c. The absolute risk difference between the drug group compared to the placebo group is negative.
d. All of the above
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