Date: 02/07/2020

Write your name in the top-right corner of the page. **You are not allowed any resources other than a standard scientific, non-graphing calculator**.

In each of the following sub-problems state what method of sampling is being used. Explain what is special about this sampling method in how the probability of a random individual being selected changes.

In a Pew Research Center poll, 1007 adults were called after their telephone numbers were randomly generated by a computer, and 85% of the respondents were able to correctly identify what Twitter is.

**For each sub-problem, refer to the frequency distribution on the left.**

Identify the upper class limits.

What is the class width of the frequency distribution?

Name three typical characteristics of normal data. Does the data in the frequency distribution seem “normal enough”? You must justify your answer based on each of the above criteria.