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.

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__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.
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__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
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__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.
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__Line Plot__~ shows the shape of the data. This uses a line and Xs to plot the data.
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__Tally Chart and Frequency Chart__~ used to collect and summarize data.**3)**Be able to calculate mean, median, mode, and range.

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You have a sheet of
cardstock paper with directions on how to calculate each of these.

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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

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the graph must
start at 0 where the two axes meet (horizontal and vertical)

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the scale
(numbers used) needs to be at equal intervals (0, 5, 10, 15…)

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the scale must be
appropriate for the numbers used

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the scale numbers
must be on the outside of the graph

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use lines (“tic
marks”) for the numbers

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the population
must be stated

__For Bar Graphs__*:*

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bars must not be
connected to the vertical axis ~ there must be a space

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bars must not be
connected to each other and must be the same width

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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

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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.

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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__
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uses a number
line to represent the data

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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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