16. Miss Mary sampled 18 buttons and found that their average size was 3.8cm. It is known that the overall average button size is 1.5cm. (a) sample (d) type of variable (b) population (e) statistic/parameter (c) variable 17. Amanda's mom found out that the average toddler knows 14.7 letters of the alphabet. She selected a group of 12 local toddlers and found that they know an average of 16.9 letters of the alphabet. (a) sample (d) type of variable (b) population (e) statistic/parameter (c) variable 18. The Aiken Mall surveyed 19 shoppers and found that they spent an average of $32.84 during their most recent visit. It is known that the overall average expenditure per visit is $18.71 (a) sample (d) type of variable (b) population (e) statistic/parameter (c) variable 19. In the world, it is estimated that 15% of people have naturally blonde hair. A recent sample of 31 people showed that 18% have naturally blonde hair. (a) sample (d) type of variable (b) population (e) statistic/parameter (c) variable 20. Ms. G's favorite class has 32 students. Out of those 32 students, they have an average of 4.28 people in their households. In all of Aiken County, the average household has 5.27 people. (a) sample (d) type of variable (b) population (e) statistic/parameter (c) variable