Stat

Question 1

Population

Answer 1

Entire collection of objects, like all UNLV students

Question 2

Sample

Answer 2

A subset of the population, to understand the entire population, like UNL students that have taken a STAT class

Question 3

Sampling issues

Answer 3

-selection bias
-non-response bias
-sampling variation

Question 4

Simple random sample

Answer 4

A collection of population items that are likely to make up the sample (like a random generator selecting people)

Question 5

Observational study

Answer 5

experimenter observes factors as they are, w no control over them

Question 6

designed experiment

Answer 6

experimenter controls the value of factors

Question 7

variable

Answer 7

-characteristic of interest
-age, gender, blood group, etc

Question 8

individual

Answer 8

object on which measurement is taken, like people

Question 9

pareto chart

Answer 9

a bar chart with decreasing order of frequencies

Question 10

describing a histogram

Answer 10

-shape
-center
-modes (unimodal, bimodal, multimodal)
-spread
-outliers

Question 11

measures of central tendency = quantitative measure

Answer 11

-mean
-medan
-mode

Question 12

measures of variability

Answer 12

-range
-sample variance and standard deviation
-inter-quartile range

Question 13

measures of relative standing

Answer 13

-quartiles
-percentiles
-z score

Question 14

inter-quartile range

Answer 14

range of the middle 50% of data

Question 15

quartiles

Answer 15

divides data into 4 equal parts

Question 16

first quartile

Answer 16

-lower quartile
-median for all observations below the median

Question 17

third quartile

Answer 17

-upper quartile
-median for all observations above the median

Question 18

second quartile

Answer 18

the median

Question 19

percentiles

Answer 19

divides data into 100 equal parts

Question 20

statistic

Answer 20

numerical summary of a sample

Question 21

parameter

Answer 21

numerical summary of a population