section 1.1 homework
Determine whether the underlined number is a statistic or a parameter. In a study of all 4926 seniors at a college, it is found that 35% own a television. Choose the correct statement below.
Parameter because the value is a numerical measurement describing a characteristic of a population.
Determine whether the data set is a population or a sample. Explain your reasoning. The age of each resident in an apartment building.
Population, because it is a collection of ages for all people in the apartment
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.
False. A population is the collection of all outcomes, responses, measurements, or counts that are of interest.
Determine whether the statement is true or false. If it is false, rewrite it as a true statement. A statistic is a measure that describes a population characteristic.
False. A statistic is a measure that describes a sample characteristic.
(2/2) Suppose a survey of 570 women in the United States found that more than 55% 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 inference from the given information.
There is an association between U.S. women and being the primary investor in their household.
(2/2) Suppose a survey of 924 car buyers found that more than 21% bought leather seats. Which part of the survey represents the descriptive branch of statistics? Make an inference based on the results of the survey. Choose the best inference from the given information.
most car buyers do not buy leather seats
Determine whether the underlined value is a parameter or a statistic. The average score for a class of 28 students taking a calculus midterm exam was 72%. is the value a parameter or a statistic?
parameter
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.
(1/2) Suppose a survey of 570 women in the United States found that more than 55% 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.
55% of women in the sample are the primary investor in their household.
Why is a sample used more often than a population?
It is usually impossible to count the entire population
(2/3) To gather information about starting salaries at companies listed in a stock index, a researcher contacts 50 of the 300 companies. Identify the population and the sample. Describe the sample data set. identify the sample for the given problem. Choose the correct answer below.
The 50 companies contacted
Determine whether the data set is a population or a sample. Explain your reasoning. The number of guests in each room of a hotel.
The data set is a population because it is a collection of guests for all rooms in a hotel
A study of 858 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 following statement is true or false. If it is false, rewrite it as a true statement. A sample statistic will not change from sample to sample.
The statement is false. A sample statistic can change from sample to sample.
Determine whether the data set is a population or a sample. Explain your reasoning. The ages of 16 members of a legislature.
This is a sample, because it is a collection of ages for some members of the legislature
How is a sample related to a population?
a sample is a subset of a population.
(1/3) To gather information about starting salaries at companies listed in a stock index, a researcher contacts 50 of the 300 companies. Identify the population and the sample. Describe the sample data set. what is the population in the given problem?
the 300 companies in the index
(1/2) Use the Venn diagram to identify the population and the sample. The parties of registered voters parties of Registered Voters who are over the age of 65 The parties of registered voters who are not over the age of 65 choose the correct description of the population.
the parties of registered voters
(2/2) Use the Venn diagram to identify the population and the sample. The parties of registered voters parties of Registered Voters who are over the age of 65 The parties of registered voters who are not over the age of 65 choose the correct description of the sample.
the parties of registered voters who are over the age of 65
(3/3) To gather information about starting salaries at companies listed in a stock index, a researcher contacts 50 of the 300 companies. Identify the population and the sample. Describe the sample data set. Describe the sample data set. Choose the correct answer below.
the starting salaries for 50 companies
(1/2) Suppose a survey of 924 car buyers found that more than 21% bought leather seats. 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.
21% of car buyers in the sample bought leather seats.
