Does the herb Echinacea help the common cold? A study investigated the 2. Does the herb Echinacea help the common cold? A study investigated the impact of echinacea vs. a standard cold medication on cold symptoms. Each subject in the study asked to take either the echinacea or a standard cold medication in capsule form. After taking the capsule for one week, the subjects then reported to the researchers the status of their cold symptoms. The researchers subsequently reported that there was no statistically significant difference in the duration of the cold between these groups. Identify the type of study. a) Cluster sample b) Social acceptability bias c) Experiment d) Observational study 3. A psychologist wishes to test a behavioral modification therapy that is claimed to improve the behavior of pre-teen autistic children. She randomly selects 40 pre-teen autistic children and exposes half of the group to the behavioral modification therapy while the other half continue with their standard treatment regimen. A standardized behavioral test is administered to each child both before and after his/her respective treatment. The sample in this experiment is a) all pre-teen autistic children. b) the 20 children who continue with their standard treatment regimen c) the 20 children who receive the behavioral modification therapy. d) the 40 selected pre-teen autistic children. impact of echinacea vs. a standard cold medication on cold symptoms. Each subject in the study chose to take either the echinacea or a standard cold medication in capsule form. After taking the capsule for one week, the subjects then reported to the researchers the status of their cold symptoms. The researchers subsequently reported that there was no statistically significant difference in the duration of the cold between these groups. The variable duration of cold in this study would be the a) Explanatory variable b) Response variable c) Population d) Statistic 4. The superintendent of San Francisco school district wants to test the effectiveness of a new program designed to improve reading skills among middle school children. There are 45 middle schools in the district. The superintendent chooses a simple random sample of six schools, and institutes the new reading program in those schools.
