Exam 4: Central Tendency and Variability

Numbers based on populations are called statistics.

A multimodal distribution has _____ mode(s).

Sylvie examined the GRE verbal scores of 10 first-year graduate students in her creative writing class to see the variability.Sylvie found the variance to be 18.225.What is the standard deviation?

A _____ distribution has two modes.

A marketing specialist for a major department store wants to know how much time people tend to spend in the store so that the audio advertisements will replay on a timed loop, allowing every customer a chance to hear each unique message.What information is this marketing specialist seeking?

The Lee family is looking to buy a house in one of two suburban areas just outside a major city, and air quality is a top priority for them.One suburb advertises the use of hybrid cars and solar panels, while the other focuses on its convenient bus routes and availability of Hummer dealerships.Is the mean or median the better measure to use for deciding which area has better air quality? (Hint: These populations are skewed.)

Six students from a psychology class reported the number of hours of television they watched per week.Here are their data: 18, 12, 15, 14, 13, 16.What is the median number of hours of television watched per week for this sample of six students?

The sum of squares is symbolized as SD.