Donny's mother has just poured him and his sister Marie glasses of orange juice. After they are poured, Donny becomes very upset that he got less juice that his sister. Their mother points out that while Donny's glass is short it is also wider and thus both children have the same amount. Donny continues to protest, arguing that his juice is shorter thus he has less juice. Piaget would explain Donny's behavior as being the result of

What is the difference between an observational study and an​ experiment? choose the correct answer below. a. in an​ experiment, a treatment is applied to part of a population and responses are observed. in an observational​ study, a researcher measures characteristics of interest of a part of a population but does not change existing conditions. b. in an​ experiment, a treatment is applied to an entire population and responses are observed. in an observational​ study, a researcher measures characteristics of interest of an entire population but does not change existing conditions. c. in an​ experiment, a researcher measures characteristics of interest of a part of a population but does not change existing conditions. in an observational​ study, a treatment is applied to part of a population and responses are observed. d. in an​ experiment, a researcher measures characteristics of interest of an entire population but does not change existing conditions. in an observational​ study, a treatment is applied to an entire population and responses are observed.