Hasset - Sample

• • Originally, 135 monkeys were from the Yerkes National Primate Research Center Field Station 53 were excluded, hence only 82 took part ➜ 61 females and 21 males.
• • 34 monkeys (23 females & 11 males) interacted with the toys on more than 5 occasions, therefore, their data was included in the analysis.
• • Reasons for excluding the 53 monkeys:
  • 14 had previously participated in research on prenatal hormones so they weren’t included in the current study (to reduce demand characteristics and order effects).
  • 39 were excluded since they were too young, and it was hard to tell their sex.