A researcher conditions rats to fear a tone that was sounded just prior to a brief shock. To measure fear following this conditioning, she records the number of lever presses by each rat in the presence and in the absence of the tone. It was hypothesized that reduced lever pressing in the presence of the tone was evidence for a conditioned fear response in rats. If the researcher tested this hypothesis at a .05 level of significance (two-tailed test), then what is her decision if she computes t = –2.842 in a sample of eight rats.
A. Retain the null hypothesis; there is evidence for a conditioned fear response.
B. Retain the null hypothesis; there is no evidence for a conditioned fear response.
C. Reject the null hypothesis; there is evidence for a conditioned fear response.
D. Reject the null hypothesis; there is no evidence for a conditioned fear response.
Ans: C
You might also like to view...
A complete reevaluation of the student’s eligibility for special education services:
a. is not necessary if school officials do not think it is needed. b. must take place once a year if parents think it is necessary. c. must take place once every two years if both parents and school officials think it is necessary. d. must take place once every three years, unless both parents and school officials agree that such a review is unnecessary.
In which instance would a researcher be most likely to use a quasi-experimental design?
a. Mr. Shijo wants to do an in-depth case study to describe which factors are present for a student with reading problems. b. Ms. Morris wants to infer whether being from an abusive home causes students to have poorer reading scores. c. Mr. Cox wants to know what percentage of students in the senior honors program belongs to minority groups. d. Ms. Ramirez decides to adopt a new math curriculum for half his students selected at random, wanting to know whether it causes those students to have better applied problem-solving skills.
New literacies
A) are socially constructed. B) are not accepted by other cultures. C) are the newest ?buzzword?. D) require a high level of technology.
Medical interventions during a coma includes all of the following EXCEPT:
a. Speech and language therapy b. Medical treatment c. Passive range of motion exercises d. Sensory stimulation