Probability and Statistics 1.1

Identify the population and the sample. Describe the sample data set. A survey of 170 law firms in a country found that the average hourly billing rate for partners was $603.

Identify the population. All law firms in the country. Identify the sample. The law firms that were surveyed. Describe the sample data set. The average hourly billing rate for partners of 170 law firms was $603.

Determine whether the data set is a population or a sample . Explain your reasoning. The carbon monoxide levels of 25 to 53 people who escaped a burning building.

The data set is a sample because the collection of 25 people is a subset to the 53 people who escaped a burning building

Determine whether the data set is a population or a sample . Explain your reasoning. The height of each student in a classroom

The height of each student in a classroom is population because it is a collection of heights for all students in the classroom.

Determine whether the underlined number is a parameter or a statistic. Telephone interviews of 1,502 adults 18 years or older found that only 69% could identify the current vice president.

statistic.

Determine whether the underlined number describes a population parameter or a sample statistic . 64 of the98 passengers aboard an airship survived an explosion.

the number is a population parameter because it is a numerical description of all the passengers that survived.

what is the difference between a parameter and a statistic

A parameter is a numerical description of a population characteristic. A statistic is a numerical description of a sample characteristic.

suppose a survey of 977 business owners found that more than 30% bought flood insurance. which part of the survey represents the descriptive branch of statistics .

Choose the best statement of the descriptive statistic in the problem. 30% of business owners in the sample bought flood insurance. Choose the best inference from the given information. Most business owners do not buy flood insurance.

Determine whether the statement is true or false, A statistic is a measure that describes a population characteristic

False , A statistic is a measure that describes a sample characteristic

A study of 840 senior citizens shows that participants who exercise regularly exhibit less of a decline in the cognitive ability than those who barely exercise at all. From this​ study, a researcher infers that your cognitive ability increases the more you exercise. What is wrong with this type of​ reasoning?

The inference may incorrectly imply that exercise increases a​ person's cognitive ability. The study shows a slower decline in cognitive ability.

Determine whether the underlined number describes a population parameter or a sample statistic . A survey of 2,212 adults in a country found that 81% think that millitant terrorists are a major threat to the well being of their 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.

How is a sample related to a population?

A sample is a subset of a population.

suppose a survey of 528 women in the US found that more than 62% are the primary investor in their household. Which part of the survey represents the descriptive branch of​ statistics? Make an inference based on the results of the survey.

Choose the best statement of the descriptive statistic in the problem. 69​%of women in the sample are the primary investor in their household. Choose the best inference from the given information. There is an association between U.S. women and being the primary investor in their household.

Use the Venn diagram to identify the population and the sample. Income of Home owners who have a garage. Income of home owners who do not have a garage

Choose the correct description of the population. The income of home owners. Choose the correct description of the sample . The income of home owners who have a garage.

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

population because it is the collection of the number of floors for all homes in the town