Stats quiz 1

what is a parameter?

a numerical summary of the population

what is a statistic?

a numerical summary of the sample data

what is a sample?

a part of the population

define qualitative variables

classification of individuals based on some attribute or characteristic

what is the process of statistics?

collect, analyze, summarize, interpret, draw conclusions

what is Data

collections of observations

length of time to take a test

continuous

define discrete variable

countable number, 0,1,2,3

what are the two branches of statistics

descriptive and inferential

number of people waiting in line

discrete

what are the two types of quantitative variables

discrete and continuous

consist of organizing and summarizing data describes data through numerical summaries, tables and graphs like averages

Descriptive statistics

Population or sample? 1.Among the senators in Congress, 54% are Republicans 2. In a large sample, the median annual income per high school graduate is $30,000. 3. A study of all 2233 passengers aboard the Titanic found that 706 survived when it sank.

population statistic population

define quanitative variables

provide numerical measures of individuals, can be added or subtracted to provide meaningful results

what is population?

the entire group of individuals on which we desire information

provides predictions about the population based on the data we collected from the sample includes the level of confidence in the results

Inferential statistic

fill in the blank "the average weight of 20 year old males in the United States will be the _______________. The average weight of 20 year old males at Mercer University will be the ________________.

Parameter, Sample

define continuous variable

infinite number of possible values