Don't Buy a Carpet

Learning objective: Variance has squared units and so in changing units the variance will grow (shrink) with the square of the growth (shrinkage) of units.
  1. A closet that is 1 yard by 4 yards has 4 square yards of space. How many square feet of space does that closet have (remember: 3 feet = 1 yard)?

  2. The number of square feet  by a factor of   times the rate for the number of square yards.

  3. The area of a room x feet by x feet varies with what function of x?

  4.  Please answer question 3 to unlock this question.

    When a change of units results in bigger numbers, the variance: