Ch 1

Question 1

Statistics

Answer 1

The science of collecting, analyzing, presenting and interpreting data as well as making decisions based on such analyses

Question 2

Descriptive statistics

Answer 2

consists of methods for organizing, displaying and describing data by using tables graphs and summary measures

Question 3

Inferential statistics

Answer 3

consists of methods that use sample results to help make decisions or predictions about a population

Question 4

population

Answer 4

consists of all elements whose characteristics are being studied

Question 5

target population

Answer 5

the population being studied

Question 6

sample

Answer 6

portion of the population selected for study

Question 7

census

Answer 7

survery that includes every member of the population

Question 8

sample survery

Answer 8

technique of collecting information from a portion of the population

Question 9

representative sample

Answer 9

sample that represents the characteristics of a population as closely as possible

Question 10

random sample

Answer 10

a sample drawn in such a way that each member of a population has a chance of being selected

Question 11

simple random sampling

Answer 11

if all samples of the same size selected from a population have the same chance of being selected

Question 12

sampling with replacement

Answer 12

each time we select an element from the population we put it back in the population before we select the next element

Question 13

sampling without replacement

Answer 13

occurs when the selected element is not replaced in the population

Question 14

element of member of a sample population

Answer 14

is a specific subject or object about which the information is collected

Question 15

variable

Answer 15

characteristic under study that assumes different values for different elements

Question 16

observation or measurement

Answer 16

the value of a variable for an element

Question 17

data set

Answer 17

a collection of observations on one or more variables

Question 18

quantitative data

Answer 18

the data collected on a quantative variable

Question 19

discrete variables

Answer 19

variable whos values are countable

Question 20

continuous variable

Answer 20

a variable that can assume any numerical value over a certain interval or intervals