We have our Statistics Test on Wednesday, March 25th.
What’s
On the Statistics Test???
1) Be able to identify what is and is not a
statistical question.
2) Be able to answer questions that require you
to read a graph or a chart for information.
«
Bar Graph ~ a bar graph uses vertical or horizontal bars to
display numerical information. The
length of the bar tells you the number it represents.
«
Histogram~ looks like a bar graph, BUT the bars are connected
and a histogram is used when you need to group the data because you have so
many different numbers in your data
«
Box-And-Whisker
Plot ~ shows the range and
distribution of data along a number line.
It is broken into four equal quartiles, highlighting the five number
summary of the data.
«
Line Plot ~ shows the shape of the data. This uses a line and Xs to plot the data.
«
Tally Chart
and Frequency Chart ~ used to collect
and summarize data.
3) Be able to calculate mean, median, mode, and
range.
□
You have a sheet of
cardstock paper with directions on how to calculate each of these.
□
Be able to defend
when to use the mean, median, or mode.
4) Be able to take information and produce a graph.
All graphs must have:
□
a title
□
the horizontal
and vertical axes labeled
□
the graph must
start at 0 where the two axes meet (horizontal and vertical)
□
the scale
(numbers used) needs to be at equal intervals (0, 5, 10, 15…)
□
the scale must be
appropriate for the numbers used
□
the scale numbers
must be on the outside of the graph
□
use lines (“tic
marks”) for the numbers
□
the population
must be stated
For Bar Graphs:
□
bars must not be
connected to the vertical axis ~ there must be a space
□
bars must not be
connected to each other and must be the same width
□
bars must be
equal distance apart ~ the space between the bars must be the same for each bar
For histograms:
Same as a bar graph EXCEPT:
□
the bars are
connected to each other
□
the data is
grouped (Remember our height activity – we grouped students 50-53 inches tall
and so on)
For box-and-whisker plots:
□
used to show the
variation of the data – how it is distributed across a number line
□
the five number
summary (low value, lower quartile, median, upper quartile, and high value) are
plotted above a number line, with a box drawn around the median, through the
lower and upper quartile values.
□
The size of the
quartiles show how the data is distributed.
Small boxes and whiskers indicate that the data is clustered in a small
area. Broad boxes and long whiskers
indicate that the data is spread out (a larger range).
□
The box shows the
middle 50% of the data values.
For a line plot:
□
uses a number
line to represent the data
□
places an X at
each number represented in your data
□
Xs must be the
same size and height
□
has a title and a
label for the horizontal scale
5) Be able
to determine an appropriate scale to be used on a graph.
«
The scale
of a graph is the “ruler” that measures the height of the line or bar.
«
The interval
is the amount of space between the values on the scale.
6) Know the difference between a tally chart and
a frequency chart. Be able to create
each one when given data.
Have a great weekend!
-Miss K :)
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