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
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 :)