Class XII

A high school receives the final scores of all students at the school who took the AP History exam last month. The assistant principal computes the mean and the standard deviation of the scores and presents her final data report to the principal. Wh
  1. Parameters x̅ and S because the scores come from a sample
  2. Statistics x̅ and S because the scores come from a sample
  3. Parameters μ and σ , because the scores come from a population
  4. Statistics μ and σ , because the scores come from a population
Given a density function, what effect will there be if the frequencies in both of the tails of the distribution are identically increased?
  1. The standard deviation will not be affected because it is a constant for any density function.
  2. The standard deviation will decrease.
  3. The standard deviation will increase.
  4. The standard deviation will not be affected because both tails experience the same amount of increase.
Anthony has caught 3 fish in a fishing tournament with lengths of 13", 15", and 17". Near the end of the tournament he catches a fourth fish, measuring 15". What effect does this fourth fish have on the mean and standard deviation of his original 3 f
  1. The mean length will stay the same but the standard deviation will increase.
  2. The mean length will stay the same but the standard deviation will decrease.
  3. The mean length and the standard deviation will be unchanged.
  4. Both the mean length and the standard deviation will increase.
A set of data is approximately normally distributed. In order from highest to lowest, list the range, the Interquartile Range (IQR), and the standard deviation.
  1. Range, IQR, Standard Deviation
  2. IQR, Range, Standard Deviation
  3. Range, Standard Deviation, IQR
  4. Standard Deviation, Range, IQR
Suppose each employee in a company receives a $3,000 raise for next year. The median salary for the employees receiving the raise will
  1. be unchanged.
  2. be multiplied by $3,000.
  3. increase by $1500
  4. increase by $3,000.
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