For assignmet 3 partB. I use dplyr library for read the data. The dataset is a supermarket transaction with over 14,000 transavtion. Below are the head of the data.

The question for part B is: For each of the following, do whatever it takes to create a bar chart of counts for Units Sold and a histogram of Revenue for the given subpopulation of purchases.

##   Transaction Purchase.Date Customer.ID Gender Marital.Status Homeowner
## 1           1    12/18/2007        7223      F              S         Y
## 2           2    12/20/2007        7841      M              M         Y
## 3           3    12/21/2007        8374      F              M         N
## 4           4    12/21/2007        9619      M              M         Y
## 5           5    12/22/2007        1900      F              S         Y
## 6           6    12/22/2007        6696      F              M         Y
##   Children Annual.Income          City State.or.Province Country
## 1        2   $30K - $50K   Los Angeles                CA     USA
## 2        5   $70K - $90K   Los Angeles                CA     USA
## 3        2   $50K - $70K     Bremerton                WA     USA
## 4        3   $30K - $50K      Portland                OR     USA
## 5        3 $130K - $150K Beverly Hills                CA     USA
## 6        3   $10K - $30K Beverly Hills                CA     USA
##   Product.Family Product.Department     Product.Category Units.Sold
## 1           Food        Snack Foods          Snack Foods          5
## 2           Food            Produce           Vegetables          5
## 3           Food        Snack Foods          Snack Foods          3
## 4           Food             Snacks                Candy          4
## 5          Drink          Beverages Carbonated Beverages          4
## 6           Food               Deli          Side Dishes          3
##   Revenue
## 1   27.38
## 2   14.90
## 3    5.52
## 4    4.44
## 5   14.00
## 6    4.37
  1. All purchases made during January and February of 2008.

  1. All purchase made by married female homeowners.

  1. All purchases made in the state of California.

  1. All purchases made in the Produce product department.

From all the four curcumstances that analyzed for the data we can see that the most unit sold is 4 units per transaction, and the most frequency revenue per purchase is between $5 and $10. Also, all the histograms are skewed to the right.