Question

does a platelet - rich plasma (prp) injection into the scalp promote hair growth? researchers identified 50 female patients with female pattern hair loss. the patients ranged in age from 30 to 60 years. for each patient, two areas with hair loss were identified. a coin toss was used to decide which area received the prp injection and which received a saline injection. injections were given to each patient at one - week intervals. after 6 months the change in the patients hair density (number of hairs per square centimeter) and hair diameter (millimeters) was measured. the mean difference in hair density (pcp minus saline) was 64.41\\(\frac{hairs}{cm^{2}}\\) and the mean difference in hair thickness was 0.07 mm. complete parts (a) through (g) below. a. the treatment is hair growth and it is set at two levels: platelet - rich plasma (prp) injection or saline injection. b. the treatment is hair growth and it is set at two levels: hair density or hair diameter. c. the treatment is the injection and it is set at two levels: hair density or hair diameter. d. the treatment is the injection and it is set at two levels: platelet - rich plasma (prp) injection or saline injection. (e) who are the experimental units? a. females b. females with hair loss 30 to 60 years of age c. females 30 to 60 years of age d. the fifty female patients

Explanation:

Experimental units are the subjects on which the experiment is performed. In this case, the experiment is about PRP injection for hair growth in female patients with female - pattern hair loss. The specific group of 50 female patients is the set of experimental units as they are the ones receiving the injections (treatments) and whose hair density and diameter are being measured.

Answer:

D. The fifty female patients