Statistics: HW 1
Suppose a survey of 950 major-appliance shoppers found that more than 31% bought extended warranties. 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 major-appliance shoppers do not buy extended warranties.
Determine whether the data set is a population or a sample. Explain your reasoning. The diastolic blood pressure of 10 patients in a hospital containing 200 patients.
Sample, because the collection of 10 patients' blood pressures is a subset of all patients in the hospital.
A polling organization contacts 2815 adult women who are 30 to 70 years of age and live in the United States and asks whether or not they had received a mammogram during the past year. What is the sample in the study?
The 2815adult women who are 30 to 70 years of age and live in the United.
What are the two main branches of statistics?
descriptive statistics and inferential statistics
Determine whether the underlined value is a parameter or a statistic. The average age of men who have walked on the moon was 39 years, 11 months, 15 days.
parameter
A parameter is a numerical description of a ______________ characteristic.
population
A statistic is a numerical description of a __________________ characteristic.
sample
How is a sample related to a population?
A sample is a subset of a population.
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.
Suppose a survey of 950 major-appliance shoppers found that more than 31% bought extended warranties. 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.
31% of major-appliance shoppers in the sample bought extended warranties.
A polling organization contacts 2815 adult women who are 30 to 70 years of age and live in the United States and asks whether or not they had received a mammogram during the past year. What is the population in the study?
Adult women who are 30 to 70 years of age and live in the United States.
In a poll, 1,002 adults in a country were asked whether they favor or oppose the use of "federal tax dollars to fund medical research using stem cells obtained from human embryos." Among the respondents, 48% said that they were in favor. Identify the population and the sample. What is the population in the given problem?
All adults in the country
Determine whether the underlined number is a statistic or a parameter. A sample of students is selected and it is found that 50% own a computer.
Statistic because the value is a numerical measurement describing a characteristic of a sample.
In a poll, 1,002 adults in a country were asked whether they favor or oppose the use of "federal tax dollars to fund medical research using stem cells obtained from human embryos." Among the respondents, 48% said that they were in favor. Identify the population and the sample. Identify the sample for the given problem.
The 1,002 adults selected.