The following problems must be turned in:

1. 50 people were studied to determine the number of hours they watch TV per week.
   1. Is this an experiment or an observational study? Why?
   2. Identify the variable of this study and determine if this is quantitative or qualitative.
   3. What is the level of measurement of this variable?
2. A group of adults are randomly divided into two blocks: one block is told to drink tea every night for a week, and the other block is told not to drink tea at night. Researchers then ask all the participating adults to record what time they fall asleep.
   1. Is this study an experiment or an observational study?
   2. Is there a control group and a treatment group?
   3. Identify the variable of this study and determine if it is qualitative or quantitative.
   4. What is the level of measurement of the variable in this study?
3. An observational study is used to determine the relationship between the number of TV’s in a household and the life expectancy of the members of those households. Identify some lurking variables and explain how these variables might effect both the number of TV’s in a household and the life expectancy of those in that household.

The following exercises should be done but do not need to be turned in:

Chapter review problems (page 33): #3, 4, 6, 7, 11.