How and why was blocking used in the design

Reference no: EM131762074

Question: Many people start their day with a jolt of caffeine from coffee or a soft drink. Most experts agree that people who take in large amounts of caffeine each day may suffer from physical withdrawal symptoms if they stop ingesting their usual amounts of caffeine. Researchers recruited 11 volunteers who were caffeine dependent and who were willing to take part in a caffeine withdrawal experiment. The experiment was conducted on two 2-day periods that occurred one week apart. During one of the 2-day periods, each subject was given a capsule containing the amount of caffeine normally ingested by that subject in one day. During the other study period, the subjects were given placebos. The order in which each subject received the two types of capsules was randomized. The subjects' diets were restricted during each of the study periods. At the end of each 2-day study period, subjects were evaluated using a tapping task in which they were instructed to press a button 200 times as fast as they could.66

(a) How and why was blocking used in the design of this experiment?

(b) Why did researchers randomize the order in which subjects received the two treatments?

Reference no: EM131762074

Questions Cloud

Explain why the sampling method used in the survey : A New York Times article on public opinion about steroid use in baseball discussed the results of a sample survey. The survey found that 34% of adults.

Unknown in the united states and europe : Why do you think this massive carnage has remained virtually unknown in the United States and Europe?

Discuss total fixed costs as a percentage of total net sales : prepare an estimate of total operating costs for 2017, assuming total fixed costs as a percentage of total net sales

Compare the information from the wikipedia entry : First, you will examine a specific entry from Wikipedia and check for changes that have occurred over a period of six months, and then you will compare

How and why was blocking used in the design : Many people start their day with a jolt of caffeine from coffee or a soft drink. Most experts agree that people who take in large amounts of caffeine each day.

Comparing the distributions of cardiovascular fitness gains : The manufacturer of exercise machines for fitness centers has designed two new elliptical machines that are meant to increase cardiovascular fitness.

What will be the expected total cost and expected cost per : If the company budgets 250,000 sales invoices in 2017, what will be the expected total cost and expected cost per unit for 2017

Historical relationship between religion and society : Utilizing the Social Gospel movement, discuss the historical relationship between religion and society in Canada.

Significance of the cristeros rebellion in mexico : Discuss the significance of the Cristeros rebellion in Mexico?(A little introduction and conclusion thank you in advance!)

User Account

All Pages