Problem Set 1.4.a: Grouped or Ungrouped

Criterion: Explain the identification of types of data.

Instruction:Fill in the table below. For each example, state whether it is grouped or ungrouped and why.

Example	Grouped or Ungrouped	Why
The time (in seconds) it takes 100 children to complete an cognitive skills game.
The number of single mothers with 1, 2, 3, or 4 children.
The number of teenagers who have experimented with smoking (yes, no).
The age (in years) of freshman students in a local college.

Problem Set 1.4.b:Understanding Descriptive and Interferential Statistics

Criterion: Explain the identification of types of data.

Instructions: Read the following and answer the question.

Gun ownership in the United States: Data from Gallup polls over a 40-year period show how gun ownership in the United States has changed. The results are described in the table below, with the percentage of Americans who own guns given in each of 5 decades:

Year	%
1972	43
1982	42
1992	48
2002	40
2012	43

Source:Reported athttp://www.gallup.com/poll/1645/Guns.aspx

1. Are the percentages reported here an example of descriptive statistics or interferential statistics? The percentages here are an example of descriptive statistics due to the percentages reported not being connected to a specific hypothesis or being used to compare to other populations. The information above is about the percentage of gun ownership within the United States.
2. Based on the percentages given in the table, how has gun ownership in the United States changed over the past 40 years? Based on the percentages give in the table, gun ownership in the United States has not varied by more than 8% from the previous or future year presented. This shows that 40-48% of the United States population owns a gun and on average around 43% each year.