Oct 3 1-1 Chapter 1 Retake/Makeup Test

Determine whether the data set is a population or a sample.

1) The age of every fourth person entering a department store

• Population

• Sample

Identify the population and the sample.

A survey of 1212 American households found that 52% of the households own a computer.

• Population: All American households; Sample: 1212 American households surveyed

• Population: 1212 American households surveyed; Sample: All American households

Determine whether the numerical value is a parameter or a statistic. Explain your reasoning.

A recent survey by the alumni of a major university indicated that the average salary of 10,500 of its 200,000 graduates was $130,000.

• Parameter: It describes the entire population of graduates

• Statistic: It is based on a subset of the population

Identify whether the statement describes inferential statistics or descriptive statistics.

The average age of the students in a statistics class is 20 years.

• Descriptive statistics

• Inferential statistics

Based on previous clients, a marriage counselor concludes that the majority of marriages that begin with cohabitation before marriage will result in divorce.

• Inferential statistics

• Descriptive statistics

Explain the difference between a sample and a population.

• A population is the entire group of individuals or objects that the researcher is interested in, while a sample is a subset of the population that is selected for study.

• A sample is the entire group of individuals or objects that the researcher is interested in, while a population is a subset of the sample that is selected for study.

If you had to do a statistical study, would you use a sample or a population? Why?

• A sample would be used because it is usually impractical to obtain data from the entire population.

• A population would be used because it provides more accurate results than a sample.

Determine whether the data are qualitative or quantitative.

the colors of automobiles on a used car lot

• Qualitative

• Quantitative

Classify Data with Respect to the Four Levels of Measurement.

hair color of women on a high school tennis team

• Nominal

• Ordinal

• Interval

• Ratio

Identify the sampling technique used.

Thirty-five sophomores, 30 juniors and 33 seniors are randomly selected from 281 sophomores, 242 juniors and 529 seniors at a certain high school.

• Stratified

• Random

• Cluster

• Convenience