Chapter 2:

 Come up to board and write the number of different types of social media YOU have used TODAY; write anywhere; no need to organize in any special way.  If you are male, please use a blue marker  If you are female, please use a black marker

 Number of different types of social media YOU have used TODAY; blue: male; black: female  One minute to talk to the person next to you about one observation you can make about our data; be prepared to share out your observation

 Number of different types of social media YOU have used TODAY; blue: male; black: female  First, it’s always helpful to...  Second, and probably more importantly, it’s always helpful to...

 Talk to the person next to you for 2 minutes. What type of graphical representation would you choose to best represent this data and why (your group doesn’t actually have to create the graphical representation at this time). Be prepared to explain/justify your reasoning/your choice.  Share out.

 Dot plots  Stem (and leaf) plots  Histograms  Box plots (later...)  (and much later)... Density curves, scatter plots, least-squares regression lines, Normal probability plots, etc.  Why didn’t I list pie charts or bar graphs?

We always want to create a graphical representation; visuals help us process information, indentify trends more easily We always label & scale our graphical representations We always use technology when available (no need to create graphical representations by hand)

 Dot plot... What’s good about dot plots? What’s not so good?  Histogram... What’s good about histograms? What’s not so good?

 Stem (and leaf) plots... What’s good about stem plots? What’s not so good?  Box Plots... In Minitab, but will learn much more about box plots later...

 Go to my website, click on COC Math 140 Survey Data Fall 2015 spreadsheet. Find the column ‘How much do you weigh (in pounds).’ Copy and past into a column in Minitab.  Create a histogram, a stem plot, a dot plot, or a box plot of this data (your choice). Be sure to label your graphical representation. Put both your names on it.  Print it, but do not turn it in yet; we will be doing something else with it in a little while.

 Frequency vs. Relative Frequency

 No matter which graphical representation you created with this data set, how could you describe your graphical representation?  What types of characteristics might we consider when trying to describe the graph of this data?

S – Shape. Symmetric? Skewed? Uni-Modal, bi-modal, tri-modal, multi-modal? O– Outlier(s) Is/are there unusually large or small values that are “away” from the majority of the rest of the data? C – Center What is the “typical*” value of the distribution/data? S – Spread Typically/on average*, how far apart or close together is the data/distribution? * Different types of ‘averages’ and ‘typical’. Will discuss further and in detail soon.

 Practice: Lets look at our social media data with a histogram, dot plot, stem plot, or box plot; & describe the distribution using SOCS  Now with the graphical representation you and your partner created from the ‘weights’ data, describe the distribution using SOCS. You have 5 minutes. You will turn this in as an assignment.  Be prepared to do a 1-minute share out as I will randomly call on a few pairs to share out

 Write on the board the type of first pet you ever had

 Type of first pet... or favorite social media, favorite app for cell phone, hair color, make of car you drive, marital status, etc.

 Bar (charts) graphs (caution; very different from histograms; why?)

 On left is bar graph; on right is histogram  Be sure you understand the difference between the two graphical representations

 Bar (Charts) Graphs  Pie Charts  BIG IDEA... the same... visualizing data can be helpful in observing trends  Can we analyze pie charts or bar graphs with SOCS? Why or why not?  Whether categorical or numerical, always good to graph your data

 Using our ‘first pet you ever had’ data, input into Minitab  Practice creating a bar graph AND a pie chart using with the pet data

 Form groups randomly (how would we like to do this?)  In your group, answer the ‘Before the Activity’ questions (one paper per group; include all names)  Gather our data (for entire class), then write it on board; let’s use blue marker for male; black for female  Input all data from class into Minitab

 Do “After the Activity;” follow all directions  1-2 paragraph write up answering questions asked in ‘After the Activity;” also include justification of the group’s choice of graphs  Include the actual graphs & numerical analysis (SOCS) of data/graphs (from Minitab)  All members of group must contribute  Maximum points possible: 20 project points.

 HW quiz on...