Answer question Negative variability Variance Sample variance

Answer question Negative variability Variance Sample variance
answer the question and show the work on the load information.

  1. You read rea a claim that variability is negative . Is this possible ? Exlain .
  2. Why is variance , as a measure of variability, preferred to the range , the IQR, the SIQR ?
  3. What are the degrees of freedom for sample variance ?
  4. What does it mean to say that the sample variance is unbiased ?
  5. Explain in the formula for variance.
  6. What does the standard deviation measure ?
  7. Based on the empirical rule what percentage of data fall within 1 SD , 2SD and 3 SD of the mean for data that are distributed normally ?
  8. State for characteristics of the standard deviation
  9. A social scientist measures the number of minutes ( per day ) that a small hypothetical population of college students spreads online.

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