A study on weight loss uses a digital scale that consistently overestimates weight by 2 pounds for all participants.Why might this lead to inaccurate results?

You are the IT manager for a local high school and need to purchase new toner cartridges for the office printers. You have two brands to choose from: Brand X cartridges, which have a mean print yield of 1500 pages with a standard deviation of 50 pages, or Brand Y cartridges, which also have a mean print yield of 1500 pages but with a standard deviation of 120 pages. Which brand of toner cartridge should you choose and why?

For a given data set, the standard deviation is 3. What is the variance?

Provide an appropriate response.Use the ogive below to approximate the cumulative frequency for 20 hours.  

Approximately 8-10% of the world’s population have blue eyes. Approximately 70-80% of the world’s population has brown eyes. Which measure of central tendency would be best for eye color? 

Determine whether the study is an observational study or an experiment.A medical researcher obtains a sample of rock climbers suffering from diabetes. She randomly assigns 89 people to a treatment group and 89 to a placebo group. The treatment group receives a medication over a period of three months and the placebo group receives a placebo over the same time frame. At the end of three months the patients’ symptoms are evaluated.

The warm up times for 10 different climbers are listed below. Find the five number summary. What is Q3?  17, 19, 20, 23, 25, 29, 33, 35, 38, 41

The distribution of incomes tend to be skewed- most have average incomes, and a few have very high incomes. What measure of central tendency would be the best choice for this kind of data? 

A researcher surveys customers at a high-end organic grocery store to measure public opinion on genetically modified foods.Which of the following best explains why the results may not accurately reflect public opinion?

For a given data set, the standard deviation is 4. What is the variance?