2.3

Question 1

two types of graph

Answer 1

histogram
polygon

Question 2

histogram

Answer 2

• on the X-axis we should include f=0 ( the value 0 is normally common means that both axes should have the )
• height bar corresponding to the frequency
  -width bar corresponding to the real limit

Question 3

polygon -midpoint-

Answer 3

-all numerics scores on X-axis
- draw dot -point- in the center of each interval + connect the dots+close the polygon with lines to the Y=0

midpoint= ( highest score+ lowest score)/2

Question 4

bar graph

Answer 4

same as the histogram the only difference is that there is space between the adjacent

Question 5

relative frequencies

Answer 5

Relative frequency is the probability of an event happening
example: we cannot know the exact number of males and females in the USA but based on the past data we can estimate an approximative number where the females are a bit outnumbering than males

Question 6

smooth curve

Answer 6

represent distribution but doesn’t rely on exact values
we don’t relate/connect series with dots but it shows the relative change

Question 7

symmetrical distribution

Answer 7

it is possible to draw a vertical line through the middle so that one side of the distribution is a mirror image of the other

Question 8

skewed distribution

Answer 8

the scores tend to pile up toward one end of the scale and
taper off gradually at the other end
-positively skewed ( tail in the right hand)
- negatively skewed ( tail in the left hand)