7. 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?
A
Descriptive statistics.
B
Inferential statistics.
C
A census.
D
A population parameter.
ANS: A PTS: 1 DIF: Moderate TOP: Key statistical concepts
8. 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 population.
ANS: C PTS: 1 DIF: Moderate TOP: Key statistical concepts
TRUE/FALSE
1. 25% of a random sample of 300 professional golfers indicate that their parents did not play golf. Based on this sample, we estimate that 25% of the parents of all professional golfers do not play golf. This is an example of statistical inference.
ANS: T PTS: 1 DIF: Moderate TOP: Key statistical concepts
2. 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.
ANS: F PTS: 1 DIF: Moderate TOP: Key statistical concepts
3. A summary measure that is computed from a population is called a population parameter.
ANS: T PTS: 1 DIF: Easy TOP: Key statistical concepts
4. A summary measure that is computed from a sample to describe a characteristic of the population is called a statistic.
ANS: T PTS: 1 DIF: Moderate TOP: Key statistical concepts
5. Statistical inference is the process of making an estimate, prediction or decision about a population, based on sample data.
ANS: T PTS: 1 DIF: Moderate TOP: Key statistical concepts
SHORT ANSWER