Exam 1: What Is Statistics

A local cable TV system using a sample of 500 subscribers finds that 40% of these subscribers watch a premium channel at least once per day. This is an example of statistical inference as opposed to descriptive statistics.

A summary measure that is computed from a sample to describe a characteristic of the population is called a statistic.

Statistical inference is the process of making an estimate, prediction or decision about a population, based on sample data.

Descriptive statistics deals with methods of:

Consider the population of all pencil manufacturers in the world. Describe any four examples of possible samples that could be taken from this population.

A politician who is running for the office of premier in a state with 1 million registered voters commissions a survey. In the survey, 52% of the 3000 registered voters interviewed say they plan to vote for her. The sample is the:

A summary measure that is computed from a sample to describe a characteristic of the population is called:

Which of the following statements is true?

Which of the following is the goal of descriptive statistics? A. To summarise data. B To display aspects of the collected data. C To summarise data and display aspects of the collected data. D To estimate characteristics of the popul ation.

Which of the following best describes the data that is collected in a statistical study for only a portion or subset of all elements of interest?

A summary measure that is computed from a population is called a population parameter.

A summary measure that is computed from a population is called:

The significance level is the relative frequency of a wrong conclusion.

You ask five of your classmates about their height. On the basis of this information, you state that the average height of the students in the sample is 170 cm. Which of the following is this an example of?