data management ch 1.1-1.4 quiz

Question 1

Population:

Answer 1

the entire group of the study

Question 2

Sample:

Answer 2

a selection of some individuals from the population

Question 3

cross-sectional:

Answer 3

measured variables at a specific point in time

Question 4

longitude:

Answer 4

measured variables over a long period of time

Question 5

raw-data:

Answer 5

unprocessed information collected for a study

Question 6

variable:

Answer 6

information you are studying which may be different for each person in the study

Question 7

qualitive variable

Answer 7

cannot be measured numerically

Question 8

quantitive variable

Answer 8

can be measured numerically

Question 9

descrete data:

Answer 9

measured with whole numbers

only for quantitive variables

Question 10

continous data:

Answer 10

measured within a given range

only for quantitive variables

Question 11

ordinal variable:

Answer 11

can be put into relative order

Question 12

nominal variable:

Answer 12

categories that cannot be ordered

Question 13

how to calcualte relative frequencies

Answer 13

frequency / total frequency

Question 14

how to calculate the angle on a circle graph

Answer 14

multiply the percent by 360
will make an angle

Question 15

how does the key work in a stem and leaf plot

Answer 15

its a random number with a line splitting the stem and leaf, beside it you would write means [the normal number]

Question 16

how does the key work in a pictograph

Answer 16

each [picture] represents _% [title]

Question 17

what are the titles for a frequency table

Answer 17

of _, tally, frequency, cumlative frequency, relative frequency

Question 18

how to find cumalitive frequency

Answer 18

add frequency with the one/ sum above

Question 19

how to find relative frequency

Answer 19

frequency / total frequency

Question 20

what is the difference between bar graphs and histographs

Answer 20

bar graphs use seperate graphs, histograph bars are togethr

Question 21

what does the bars apart from eachother represent for a bar graph

Answer 21

that there is seperation between the groups

Question 22

what does the bars touching represent for a histograph

Answer 22

that the bars are continous range of values

REMEMBER there is no interval notation in the x-axis

Question 23

how do you explain intervals when reffering to a histogram

Answer 23

the [ represents ≤
the ) represents >

Question 24

how do you calculate the bin width

Answer 24

max value - min value / # of bins

ALWAYS round answer up if there is a decimal

Question 25

what is a frequency polygon

Answer 25

the same information as a bar graph but simpler to look at its a line

Question 26

ogive (cumalitive frequency)

Answer 26

the running total from lowest value up the cumalative frequency are the y-values

Question 27

frequency tables **for** histograms | 1. what notation 2. what else is there 3. what if there is a polygon

Answer 27

you have to use interval notation; (there may also be a midpoint which means the meadian of the interval) if there is a polygon, just draw a line in the middle of the bars

Question 28

relative frequency polygons | the y-values

Answer 28

the y-values go from 0-1, go up 0.1, 0.2, 0.3

Question 29

what is the median

Answer 29

the middle value

Question 30

what is the mode

Answer 30

the most frequent number

Question 31

what is the median

Answer 31

the average, add all the numbers together, divide by the total amout of numbers

Question 32

x-bar formula and what does it mean

Answer 32

the x bar is the sample mean, it calculates the mean ..........Σx x̄ = —— ..........n

Question 33

how to calculate the weighted mean

Answer 33

multiply the percent with the 'mark' for example

Question 34

weighted mean formula

Answer 34

...........Σxw x̄w = —— .............Σx remember the denominator will always equal 100%