Bus 230 Exam 1 (Chapter 1)

the most common numerical descriptive statistics is the

mean

A. can be either numeric or nonnumeric

categorical data

in a post office, the mailboxes are numbered from 1 to 4,500. these numbers represent a. categorical data b. quantitative data

categorical data

labels or names used to identify an attribute of each element

categorical data

they cannot be measured on a natural numerical scale; they can only be classified into one of a group of categories

categorical data

data can be further classified as being

categorical or quantitative

the process of conduction a survey to collect data for the entire population is called

census

the key difference between an observational study and an experiment is that an experiment is

conducted under controlled conditions

the facts and figures collected, analyzed, and summarized for presentation and interpretation

data

all the data collected in a particular study are referred to as the ______ for the study

data set

in a sample of 800 students in a university, 240 or 30% are business majors. The 30% is an example of

descriptive statistics

summaries of data, which may be tabular, graphical, or numerical, are referred to as

descriptive statistics

the entities on which data are collected

elements

the variable of interest is first identified. then on or more other variables are identified and controlled so that data can be obtained about how they influence the variable of interest

experimental studies

a study randomly assigned volunteers to one of two groups: one group was directed to use social media sites as they usually do. one group was blocked from social media sites. the researchers looked at which group tended to be happier. Which type of study method is this?

experimental study

quantitative date indicates

how many or how much

the set of measurements obtained for a particular element is called

observation

a study took a random sample and examined their social media habits. Each person was classified as either a light, moderate, or heavy social media user. The researchers looked at which groups tended to be happier. Which type of study is this?

observational study

observe what is happening in a particular situation, record data on one or more variables of interest, and conduct a statistical analysis of the resulting data

observational study

the set of all elements of interest in a particular study

population

always numeric

quantitative

measurements that are recorded on a naturally occurring numerical scale

quantitative data

a subset of the population

sample

the process of conduction a survey to collect data for a sample is called

sample survey

in a sample of 400 students in a university, 80 or 20% are business majors. Based on the above information, the school's paper reported that "20% of all students at the university are Business majors." this report is an example of

statistical inference

statistics uses data from a sample to make estimates and test hypotheses about the characteristics of a population through a process referred to as

statistical inference

the art and science of collecting, analyzing, presenting, and interpreting data

statistics

examples of commonly used observational studies are

surveys and public opinion polls

a factory overseer selects 40 threaded rods at random from those produced that week at the factory, then she tests their tensile strength. Identify the population and sample in this setting.

the population is threaded rods produced at the factory that week; the sample is the 40 threaded rods selected

a characteristic of interest for the elements

variable