Question

class a class b each of the dot plots shown represents the number of glue sticks brought in by each student for two classes, class a and class b. which statement best compares the standard deviations of the numbers of glue sticks brought in by each student for these two classes? a the standard deviation of the number of glue sticks brought in by each student for class a is less than the standard deviation of the number of glue sticks brought in by each student for class b. b the standard deviation of the number of glue sticks brought in by each student for class a is equal to the standard deviation of the number of glue sticks brought in by each student for class b. c the standard deviation of the number of glue sticks brought in by each student for class a is greater than the standard deviation of the number of glue sticks brought in by each student for class b. d there is not enough information to compare these standard deviations.

Explanation:

Standard deviation measures data spread. Both dot plots have symmetric distributions with similar dot - by - dot counts (e.g., Class A: 1,2,3,4,5,6,7 with dots; Class B:14,15,16,17,18,19,20 with dots, same pattern). So their spreads (standard deviations) are equal.

Answer:

B. The standard deviation of the number of glue sticks brought in by each student for class A is equal to the standard deviation of the number of glue sticks brought in by each student for class B.