Astudy will investigate the effectiveness of a new early reading program on
prekindergarten students' reading abilities. the samples (n = 30 and
n =40) included in the study are taught by two preschool teachers.

which of the
following are possible limitations of the study? select all that apply.

a. the sample size is too small.

b. the teachers may differ in number of years teaching.

c. the teachers may differ in early childhood experience.

d. the teachers may differ in number of years teaching reading.