Question: A large manufacturing firm is interested in the effect of the temperature of the manufacturing floor on worker productivity. Over the course of a year. The firm randomly samples its 103 sites and records the temperature and the quantity of items produced on that day. Is this an experiment or an observational study?
Question: In a study to add a new feature to a software program, the programmer introduced two categories, men and women, in the survey she conducted. Is the study observational or experimental? What is the controlled factor?
Question: A biology student is interested in the relationship between temperature and germination time to soy beans. The student gets sample seeds from multiple sources and randomly selects 180 seeds from them. Then he sets up three growing stations. On at 20C, one at 15C, and one at 25C. he divides the seeds into three groups of 60 and plants the seeds from each group in a growing station. He records the germination time of each side. Is this an observation study or an experiment? if it is an experiment, what is controlled factor.?
Question: a study was conducted among school students on the relationship between getting up late and getting to school late. Is this an example of an observational study? If it is an experiment, what is the controlled factor?
Question: In a study to support drug discovery for patients with lung cancer, patients were divided into 3 groups based on the severity of the disease. Smoking and alcohol consumption habits for all 3groups. Is this an example of an observational study of experimental study?
Question: An opinion poll was conducted to know whether parents play n role in shaping a career for their children. Respondents were asked to vote “yes” if they think parents have a role to play and “No” if they think parents have no role to play in shaping the career of their children. Is the study observational or experiment, what is the controlled factor.?
Question: Is an online poll asking the preferred mobile phone type used by school children an observational study or experimental study? If it is an experiment, what is controlled factor?
Question: A biologist is interested in finding the relationship between the amount of sunlight and the growth rate of sunflowers. Would an experimental of observational study design be more appropriate?
Instituition / Term
Term
Year 2022
Institution
MATH 225N Statistical Reasoning for the Health Sciences
