Exam 1: The Nature of Probability and Statistics

What is meant by a biased sample?

Inferential statistics is based on probability.

What level of measurement allows for the ranking of data, a precise difference between units of measure, and also includes a true zero?

Rating a restaurant by a number of stars is an example of an ordinal level of measurement.

In a randomized experiment, if there are large differences in outcomes among the treatment groups, we can conclude that the differences are due to _____________________.

If a weather center monitors and calculates the average number of tornadoes that pass through Topeka, Kansas each year, what type of variable would they be investigating?

______________ sampling is used when the population is large and it includes subjects residing over a large geographic area.

In an advertisement for a car, a driver is shown driving expertly through a difficult road course. At the bottom of the ad, the following is included in small print "Professional Driver on a closed course". Which of the following choices best describes this misuse of Data?

An electronics manufacturer test every 500th cell phone to verify that it is functioning properly. Identify the kind of sample that is being used.

A ______________ variable assumes values that can be counted.

When running an experimental study, the group that is manipulated can be called the treatment group.

A dependent variable can also be referred to as an outcome variable.

Which one of the following data are continuous?

An advertisement for a truck states that it is 15% more powerful. This is an example of _________________.

Which one of the following data are discrete?

Which of the following is the best description of a randomized experiment?

In an experiment, subjects are put into two categories according to sex, and then each subject is randomly assigned a treatment . This is an example of...

Determine which branch of statistics was used to make the following statement. In 2025, the world population is predicted to be 8 billion people.

The four basic methods used to obtain samples are: random, irregular, cluster, and stratified sampling.

Determine which branch of statistics was used to make the following statement. Based on a sample of 2739 respondents, it is estimated that pet owners spent a total of 14 Billion dollars on veterinarian care for their pets.