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 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 (c) what are the response variables in this study? select all that apply. a. hair density (number of hairs per square centimeter) b. female pattern hair loss c. hair diameter d. gender e. age

Explanation:

A response variable is what is measured in an experiment. In this study, the researchers measured the change in hair density and hair diameter. These are the variables that respond to the treatment (PRP or saline injection). Female pattern hair loss is the condition of the subjects, gender and age are characteristics of the subjects, not what is being measured as a response to the treatment.

Answer:

A. Hair density (number of hairs per square centimeter), C. Hair diameter