To study the effects of music on sleep quality in adults 18 years or older, 100 adults were given thePittsburg Sleep Quality Index (PSQI) and then asked to listen to 30 min of music at bedtime for threeweeks. At the end of the three weeks, subjects were given the PSQI again and the change in score wasreported.(a) What type of experimental design is this? Matched paired design(b) What is the population being studied? adults 18 years or older(c) What are the experimental units? adults 18 or older(d) What is the response variable? PSQI(e) What is the explanatory variable? 30 Mins of music at bedtime(f) Name one other factor that could influence the response variable. This part will be hand graded.

Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at a time so we are answering the first three as you have not mentioned which of these you are looking for. Please re-submit the question separately for the remaining sub-parts. Given: The effects of music on sleep quality in adults 18 years or older, 100 adults were given the Pittsburg Sleep Quality Index (PSQI) and then asked to listen to 30 min of music at bedtime for three weeks. At the end of the three weeks, subjects were given the PSQI again and the change in score was reported.(a) When there are just two treatment conditions in an experiment, a matched pairs design is employed. Based on a "matching" characteristic, such as age or gender, the participants in the experiment are paired up into groups called pairs. The subjects are then randomly randomized to various treatments within each pair. Here, same individuals are tested with two different conditions. Therefore its is a matched pair design.(b) Population is the collection of all subjects which are of interest of the study. Here the effects of music on sleep quality in adults 18 years or older and a sample of 100 people is selected randomly from all adults who are 18 years or older. Therefore the population is the all adults of 18 years or older.(c) Experimental units are the subjects on which the treatments or the conditions are applied. Here two conditions are applied on the 100 adults of 18 years or older. Therefore the experimental units are the 100 adults of 18 years or older.