hello my name is Kaley today we will be doing graphing number two part one about
bar graphs no matter what kind of scientist you are the first thing you do
is ask a question scientists can ask two types of questions the first type of
questions are quantitative questions and quantitative questions have to do with
numbers like how many how much and what's the majority and what is the
minority the other type of question scientists can ask are qualitative and
qualitative questions have to do with trends or patterns like did it get
bigger did it get smaller was there improvement and how did it change do you
see how these questions can be different one about numbers and one about patterns
today we are going to ask both kinds of questions first we will ask a
quantitative question one that has to do with numbers like what color eyes are
the majority in our family meaning which eye color is the most popular in our
family brown blue green or black before we ask our question let's build a table
to keep track of our answers we know what to put under eye color brown blue
green and black we will make a tally mark for every time we get an answer for
one of our colors this is our data we will ask everyone in the family what
color their eyes are and their answers will go on our data
column the how many people column well let's get to it what color are your eyes
we will start to log the answers or data in our table like this under our data
column how many people the more family members we ask the more data we collect
let's keep going now our table looks good lots of data we
have asked everyone in the family what color are your eyes and we have filled
in a lot of tally marks in our data column now it is time to remember that
we are asking a quantitative question a question that is about numbers and then
in the case of our question we want to know what eye color is the majority or
occurs the most in our family but this table is kind of hard to read so let's
use a graph to make it more clear which eye color is the majority in our family
we can use a graph like this one it's called
a bar graph a bar graph has an x axis on the bottom it's that yellow line down at
the bottom of the graph do you see where the arrow is pointing the x axis tell us
us the things we are asking about for us our x axis will show the different eye
colors we are asking about brown blue green or black a bar graph also has a
y-axis on the side of the graph it's that purple line that you see see where
the purple arrow is pointing this axis tells us the number of things for our
graph the y-axis is our data or the number of people that have each eye
color in our family we can find all of this information
from our table the x-axis is the things we are asking about the different eye
colors and the y-axis is our numbers the data we collected about how many people
in the family have each eye color so let's draw our graph the orange bar is
our x-axis with the eye color names-- and the purple bar is our y-axis and it
will be the number of people so let's graph it we draw a bar for each eye
color that is as tall as the number of people who have that eye color on our
table we can see that brown eyes has seven tally marks see where it's circled
and for the bar for brown eyes goes up to the number seven on our graph see the
dotted line that's seven on our graph and we can see the same thing for the
other eye colors blue eyes has four tally marks and the bar on our graph
goes up to the four on the y-axis green eyes has three tally marks and the bar
goes up to three on the graph where that dashed green line is and black eyes has
only two tally marks and the bar goes up to two on the graph so now it's really
easy to see which eye color is the majority in our family it'll be the eye
color that has the tallest bar on the graph I can easily see which one is the
tallest do you see it so this means that the majority of people in our family
have brown eyes brown eyes are the most popular and the same is true for the
minority or the least popular eye color in our family
this means the least amount of people have that color so it's going to be the
shortest bar on the graph and I can see which one is the shortest it's the black
eye bar so that means that black eyes are
least popular in our family great job you used a bar graph from data that you
collected to answer a quantitative question