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 (prp 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. (b) what is the population that is being studied? a. the fifty female patients b. females with hair loss 30 to 60 years of age c. females 30 to 60 years of age d. adults 30 to 60 years of age

Explanation:

In a matched - pairs design, for each experimental unit (in this case, each patient), two related observations (the two areas on the scalp) are made. Here, each patient has two areas (one getting PRP and one getting saline), which fits the matched - pairs design.

For the population: The study is about female pattern hair loss. The patients are female with hair loss in the age range of 30 - 60 years. The population is the group that the researchers want to generalize the results to. The sample is the 50 female patients. The population is females with hair loss 30 to 60 years of age.

Answer:

(a) D. Matched - pairs design
(b) B. Females with hair loss 30 to 60 years of age