Observational Studies, Experiments, and Surveys Statistics Producing Data Observational Studies, Experiments, and Surveys Questions A random sample of 40 tea drinkers scores much lower on a stress scale than a random sample of those who do not drink tea. Does drinking tea lower stress? You weigh 30 people who exercise every day, and you weigh 30 people who do not get regular exercise. The exercise group has a mean weight which is 22 pounds less than the non-exercise group's mean. Can you conclude that exercise causes people to weigh less? How do you minimize response bias? What is non response bias? What are some basic guidelines concerning the design of a questionnaire? What is wrong with the answer choices to the question: How much did you like your statistics course this semester? (A.) Not at all (B.) A lot (C.) It was awesome! What are some guidelines for creating appropriate questions for a questionnaire? How did you find the seminar? Suppose a survey of 511 women in the United States found that more than 63% are the primary investor in their household. Which part of the survey represents the descriptive branch of statistics? What is the difference between a casual relationship and correlation? What is the sample mean for the data? Producing Data View all chapters Sampling Techniques Observational Studies, Experiments, and Surveys Experimental Design Prev Next