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