Each of the eight observations in a data set is increased by 7
MATHEMATICS · Single correct · A Level · Mathematics · Data presentation and interpretation · Data presentation and interpretation
Problem
Each of the eight observations in a data set is increased by 7. Which statement about the variance and standard deviation of the new data set is correct?
(a) Both variance and standard deviation each increase by 7.
(b) Variance increases by 49 while standard deviation increases by 7.
(c) Both variance and standard deviation remain unchanged.
(d) Variance remains unchanged but standard deviation increases by 7.