Statistics 1
When using descriptive statistics, we often go "beyond" the data we have.
False
descriptive statistics are used to make inferences about a population
False
A parameter is defined as
A number calculated on population data that quantifies a characteristic of the population
A parameter is defined as _____.
A number calculated on sample data that quantifies a characteristic of the sample
Let's assume you are conducting an experiment to determine the effect of a new drug on the incidence of epileptic seizures. You select 20 epileptics from the 150 epileptics being treated at a nearby hospital and administer the drug to them. You record the number of seizures in each of the 20 subjects for one month. The average (mean) number of seizures for the 20 subjects is called
A statistic
inferential statistics
Also uses methods of descriptive statistics AND allows one to make inferences about a population based on sample data
If one measured the height of all women at a university and took an average of the data, the university of women would be a sample of the population of all university women in the world
False
In inferential statistics random sampling is regarded and desirable but not essential
False
Inferential statistics involves inferring something about a sample from population data
False
Any summary number computed from population data is called a statistic
False
Descriptive statistics would allow us to determine the President's current approval rating
False
Graphing and summarizing data are both functions of inferential statistics.
False
If one computed the mean IQ of all male psychology majors at Troy in an attempt to estimate IQ of all male psychology majors in the US, the computed mean would be a sample
False
The goal of descriptive statistics is solely to summarize and organize data
False
In order to estimate the average (mean) weight of all professional football players, an investigator determines the weight of the Dallas Cowboy players. The average (mean) weight of all professional football players is called a
Parameter
In order to estimate the height of all students at your university, let's assume you have measured the height of all psychology majors at the university. If you had measured the height scores of all students at your university, the average (mean) of these scores would constitute a _______
Parameter
In order to estimate the average (mean) of all professional football players, and investigator determines the weight of the Dallas Cowboys players. All professional football players constitute a
Population
In order to estimate the ration of white and black students in his college, a professor determines the proportion of whites and blacks in his class. The students of the entire college are called a ____.
Population
In inferential statistics the object is usually to generalize from a ______ to a ______.
Sample;population
In order to estimate the amount of TV watched by New York City adults, a sociologist surveys a random sample of adults from this city. The average (mean) of the raw scores is a ______
Statistic
In order to estimate the attention level of college undergraduates in the United States, a psychologist measures the attention span of the undergraduates at a local university. The mean of the scores is a ______.
Statistic
In order to estimate the height of all students at your university, let's assume you have measured the height of all psychology majors at the university. The average (mean) value of the measured height scores constitute a _________
Statistic
Sample is defined as
The subjects in an experiment and a subset of the population
A statistic is to a sample as a parameter is to a population
True
Any summary number computed from population data is called a parameter
True
Any summary number computed from sample data is called a statistic
True
Descriptive statistics involves characterizing the obtained data
True
Descriptive statistics involves making sense of the data obtained
True
Descriptive statistics involves making sense of the obtained data
True
Estimation and prediction are two primary uses of inferential statistics
True
If one measured IQ of all male psychology majors at Troy in an attempt to estimate IQ of all male psychology majors in the US, male psychology students in the US are the population
True
Inferential statistics uses the sample data to generalize to populations
True
Inferential statistics would allow us to determine the Congress' current approval rating.
True
Inferential statistics would allow us to estimate the number of people in the US that are overweight
True
When you have data from the entire population, descriptive statistics are very useful
True
A statistic is defined as ____.
a number calculated on sample data that quantifies a characteristic of the sample
Descriptive statistics are helpful in ______ and _____ raw data
summarizing; characterizing