Exam 9: Data Sources: Experiments

A survey of online consumers asked respondents to indicate how much money they spent for online purchases during the most recent Christmas holiday season.These data were analyzed to see if gender and income level influence the amount consumers spend online for holiday shopping.Which of the following statements is TRUE? I.This is an experimental study. II.This is a randomized block design. III.This is an observational study.

Is the aspirin produced by World's Best Pharmaceutical Company better than that of a competitor at relieving headaches? 200 headache suffers are chosen at random.Migraned Testing Service administers the experiment and provides the results evaluation.Three levels are made: participants receive contents from Bottle A, Bottle B, or Bottle C).Other than the fact that one bottle contains placebo aspirin, no other information is given to the testing service regarding the bottles' contents.

Which is NOT a critical part of designing a good experiment?

Data obtained from a survey of online customers were analyzed to see if gender and income level influence the amount consumers spend online for holiday shopping.The interaction plot shown below suggests that ________________________ .

A Columbia University study linked soda consumption to behavior problems in children.Researchers examined data from a previous study that followed 2929 mother-child pairs.One survey asked about behaviors of the child and also about soda consumption.They found that the more soda the kids drank, the more behavior problems they had.What aspect of a well-designed experiment is absent from this study?

Quality control engineers fire tiles made with a new material at three different temperature settings (1500ºF, 1800ºF and 2200ºF) and for four different times (2 hours, 6 hours, 10 hours and 12 hours) to determine the optimal parameter settings for firing that will result in tiles with high flexural strength.The number of treatments in this experiment is ________________________ .

A company has tried to improve the effectiveness of its dishwashing detergent and wants to see if it works better than the original formula.They use 6 identical new dishwashers and load them identically with dirty dishes.Three packs of each of the two types of detergent are used, and they are randomly assigned to one of the six dishwashers.After the load is run, they rate each load for overall cleanliness.Which of the following is TRUE?

An advocacy group is interested in determining if gender (1 = Female, 2 = Male) affects executive level salaries in three different industries: (1 = Consumer Goods, 2 = Financial, 3 = Health Care).The number of treatments in this example is________________________ .

A health food company is examining three different blanching processes to determine which is best in terms of vitamin A retention (mg/100mg) for dark green vegetable material.The response variable is ________________________ .

Quality control engineers fire tiles made with this new material at three different temperature settings (1500ºF, 1800ºF and 2200ºF) and for four different times (2 hours, 6 hours, 10 hours and 12 hours) to determine the optimal parameter settings for firing that will result in tiles with high flexural strength.The response variable in this experiment is ________________________ .

Quality control engineers fire tiles made with this new material at three different temperature settings (1500°F, 1800°F and 2200°F) and for four different times (2 hours, 6 hours, 10 hours and 12 hours) to determine the optimal parameter settings for firing that will result in tiles with high flexural strength.The response variable in this experiment is ________________________ .

Which of the following is not one of the four principles of experimental design?