Question

10. (1 pt) For which of the following situations is the dependent groups t-test appropriate (if not appropriate, why?)

a. The IV is presence or absence of conversation directed to comatose patients (same patients with and without conversation); the DV is the patients’ intracranial pressure.

b. The IV is birth type (home vs hospital); the DV is perceived functional ability of the patient on a 20 point scale 48 hours after surgery.

c. The IV is time since incarceration for a single group of ex-cons (measured at 1 months and 6 months); the DV is body weight.

d. The IV is menopausal state (pre vs during vs post) in the same women over time; the DV is attitudes toward menopause (measured in a survey score 1-20).

Answer 1

dependent groups t-test is appropriate in cases where

(i) the sample sizes are equal i..e., n1=n2=n(say)

(ii) the two samples are not independent but the sample observations are paired together, i.e., the pair of observations (xi,yi),(i=1,2,...n) corresponds to the same (ith) sample unit.

in this question a     are those situtions where dependent groups t-test is appropriate.

(a) The IV is presence or absence of conversation directed to comatose patients (same patients with and without conversation); the DV is the patients’ intracranial pressure.

is appropriate for dependent t-test since here we are testing same comatose patients with and without conversation.

(b) The IV is birth type (home vs hospital); the DV is perceived functional ability of the patient on a 20 point scale 48 hours after surgery.

is appropriate for dependent t-test since here we are testing same patient for two types of functional ability on a 20 point scale 48 hours after surgery home vs hospital.

(c) The IV is time since incarceration for a single group of ex-cons (measured at 1 months and 6 months); the DV is body weight.

is appropriate for dependent t-test since here we are testing same ex-cons's body wieght time since incarceration.

(d). The IV is menopausal state (pre vs during vs post) in the same women over time; the DV is attitudes toward menopause (measured in a survey score 1-20).

is appropriate for dependent t-test since here we are testing same women' s attitudes toward menopause (pre vs during vs post) over time