Chapter 1 Test

Determine if the survey question is biased. If the question is biased, suggest a better wording. Why is eating ice cream bad for you? Choose the best question below.

• The question is biased. The wording "Do you think that eating ice cream is good for you?" would be better.

• The question is biased. The wording "How do you think eating ice cream affects your health?" would be better.

• The question is biased. The wording "Why is eating ice cream good for you?" would be better.

• The question is biased. The wording "Do you think that eating ice cream is bad for you?" would be better.

• The original question is not biased.

Determine whether the data set is a population or a sample. Explain your reasoning. The number of floors in each home in a town. Choose the correct answer below.

• Population, because it is a collection of the number of floors for all homes in the town.

• Population, because it is a subset of all homes in the state.

• Sample, because it is a collection of the number of floors for some homes in the town.

• Sample, because it is a collection of the number of floors for all homes in the town, but there are homes in other towns.

Determine whether the underlined number describes a population parameter or a sample statistic. Explain your reasoning. A survey of 2213 adults in a country found that 77% think that militant terrorists are a major threat to the well-being of their country. Choose the correct statement below.

• The number is a population parameter because it is a numerical description of all of the people in the country.

• The number is a population parameter because it describes the people in a sample, which is a subset of all of the people in the country.

• The number is a sample statistic because it is a numerical description of all of the people in the country.

• The number is a sample statistic because it describes the people in a sample, which is a subset of all of the people in the country.

Determine whether the statement is true or false. If it is false, rewrite it as a true statement. Using a systematic sample guarantees that members of each group within a population will be sampled. Choose the correct answer below.

• True.

• False. Using a stratified sample guarantees that members of each group within a population will be sampled.

• False. Using a cluster sample guarantees that members of each group within a population will be sampled.

A quality-control manager randomly selects 60 bottles of tomato sauce that were filled on November 19 to assess the calibration of the filling machine. What is the population in the study?

• All bottles of tomato sauce produced in the plant in the given year.

• The 60 bottles of tomato sauce selected in the plant.

• The 60 bottles of tomato sauce selected in the plant on November 19.

• All bottles of tomato sauce produced in the plant on November 19.

A quality-control manager randomly selects 60 bottles of tomato sauce that were filled on November 19 to assess the calibration of the filling machine. What is the sample in the study?

• All bottles of tomato sauce produced in the plant in the given year.

• The 60 bottles of tomato sauce selected in the plant.

• The 60 bottles of tomato sauce selected in the plant on November 19.

• All bottles of tomato sauce produced in the plant on November 19.

Observational studies are sometimes referred to as natural experiments. Explain what this means. Choose the correct answer below.

• In an observational study, subjects are assigned to different treatment groups through random selection.

• In an observational study, a researcher measures characteristics of interest of a part of a population but does not change existing conditions.

• In an observational study, a treatment is applied to part of a population and responses are observed.

• In an observational study, subjects are paired up according to a similarity.

Determine whether the statement is true or false. If it is false, rewrite it as a true statement. A population is the collection of some outcomes, responses, measurements, or counts that are of interest. Choose the correct answer below.

• False. A population is the collection of all outcomes, responses, measurements, or counts that are of interest.

• True.

• False. A sample is the collection of all outcomes, responses, measurements, or counts that are of interest.

Determine whether the data set is a population or a sample. Explain your reasoning. The salary of each teacher in a school. Choose the correct answer below.

• Sample, because it is a collection of salaries for all teachers in the school, but there are other schools.

• Population, because it is a subset of all schools in the city.

• Population, because it is a collection of salaries for all teachers in the school.

• Sample, because it is a collection of salaries for some teachers in the school.

Determine whether the statement is true or false. If it is false, rewrite it as a true statement. More types of calculations can be performed with data at the nominal level than with data at the interval level. Choose the correct answer below.

• True.

• False. The same types of calculations can be performed with data at the nominal level and with data at the interval level.

• False. More types of calculations can be performed with data at the interval level than with data at the nominal level.