Question

9.  For which of the following situations is the independent groups t-test appropriate (if inappropriate, why?):

a.         The independent variable is infant birth weight at one week (normal vs high); the dependent variable is resting heart rate.

b.         The independent variable is radiation treatment on throat cancer patients (one group getting a low dose and the other a high dose treatment); the dependent variable is white blood cell count.

c.         The IV is infant birth weight (grouped as low vs high); the DV is number of days absent from school in first grade.

d.         The IV is marital status (single vs divorced vs married); the DV is a happiness score, based on a 50 point scale.

           

10.       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

9)

a) Appropriate. ( Two groups are interval or ratio.)

b)  Appropriate. ( Two groups are interval or ratio.)

c)  Appropriate. ( Two groups are interval or ratio.)

d) Inappropriate because marital status has multiple groups.

10)

a) Appropriate. (assuming that the patients are used for with and without conversations.)

b) Inappropriate because the DV is ratio.

c) Appropriate.

d) Inappropriate because the menopausal state has multiple values.(i.e. more than 2)