Homework Section 1.1
What is inferential statistics?
inferential statistics uses methods that generalize results obtained from a sample to the population and measure the reliability of the results.
Determine whether the variable is qualitative or quantitative: "favorite song" - the variable is quantitative because it is an attribute characteristic. - the variable is quantitative because it is a numerical measure. - the variable is qualitative because it is a numerical measure. - the variable is qualitative because it is an attribute characteristic.
the variable is qualitative because it is an attribute characteristic.
Determine whether the variable is qualitative or quantitative: FAVORITE COLOR - the variable is quantitative because it is an attribute characteristic. - the variable is qualitative because it is a numerical measure. - the variable is qualitative because it is an attribute characteristic. - the variable is quantitative because it is a numerical measure.
the variable is qualitative because it is an attribute characteristic.
_________ are the characteristics of the individuals within the population. samples variables statistics parameters
variables
What is a parameter?
a parameter is a numerical summary of a population
What is a sample?
a sample is a subset of the population being studied
Determine whether the variable is qualitative or quantitative: "NUMBER OF MEGABYTES OF RAM IN A COMPUTER" - the variable is quantitative because it is a numerical measure - the variable is qualitative because it is a numerical measure - the variable is quantitative because it is an attribute characteristic. - the variable is qualitative because it is an attribute characteristic.
the variable is quantitative because it is a numerical measure
Determine whether the variable is qualitative or quantitative: "distance in miles from one city to another" - the variable is quantitative because it is an attribute characteristic. - the variable is qualitative because it is a numerical measure. - the variable is quantitative because it is a numerical measure. - the variable is qualitative because it is an attribute characteristic.
the variable is quantitative because it is a numerical measure.
Determine whether the given value is a statistic or a parameter: "In a study of all 4841 students at a college, it is found that 55% own a computer." Chose the correct statement below: - Parameter because the value is a numerical measurement describing a characteristic of a population. - Statistic because the value is a numerical measurement describing a characteristic of a sample - Statistic because the value is a numerical measurement describing a characteristic of a population. - Parameter because the value is a numerical measurement describing a characteristic of a sample.
Parameter because the value is a numerical measurement describing a characteristic of a population.
Determine whether the underlined numerical value is a parameter or a statistic. Explain your reasoning. A poll of all 2000 students in a high school found that 94% of its students owned cell phones. Is the value (94%) a parameter or a statistic? - Statistic, because the data set of all 2000 students in a high school is a sample. - Parameter, because the data set of a sample of students is a sample. - Statistic, because the data set of a sample of students is a sample. - Parameter, because the data set of all 2000 students in a high school is a sample. - Parameter, because the data set of a sample of students is a population. - Parameter, because the data set of all 2000 students in a high school is a population. - Statistic, because the data set of all 2000 students in a high school is a population. - Statistic, because the data set of a sample of students is a population.
Parameter, because the data set of all 2000 students in a high school is a population.
Determine whether the underlined value is a parameter or a statistic. "In a national survey of high school students (grades 9 to 12), 25% of the students who responded reported that someone had offered, sold, or given them an illegal drug on school property. Is the value (25%) a parameter or a statistic? - The value is a statistic because the respondents who were high school students (grades 9-12) are a sample. - The value is a parameter because the respondents who were high school students (grades 9-12) are a sample. - The value is a statistic because the respondents who were high school students (grades 9-12) are a population. - The value is a parameter because the respondents who were high school students (grades 9-12) are a population.
The value is a statistic because the respondents who were high school students (grades 9-12) are a sample.
What is descriptive statistics?
descriptive statistics consists of organizing and summerizing information collected
_________ statistics consists of organizing and summarizing information collected, while ________ statistics uses methods that generalize results obtained from a sample of the population and measure the reliability of the results. descriptive inferential qualitiative quantitative
descriptive; inferential
A(n) _______ is a person or object that is a member of the population being studied. sample individual parameter statistic
individual
A(n) ______ is a numerical summary of a population. parameter statistic continuous variable discrete variable
parameter
A(n) _________ is a numerical summary of a sample. parameter statistic continuous variable discrete variable
statistic
