1. At what level of measurement is the data: nominal, ordinal, interval or ratio?

a. The volume of a mug, in milliliters.

b. The type of the liquid in a mug.

c. The temperature of the liquid in a mug, in degrees Fahrenheit.

2. Identify the errors made by the researchers described below.

a. A doctor finds that patients with long hair tend to have lower blood pressure than patients with short hair. The doctor concludes that long hair lowers blood pressure.

b. A town mayor mails a poll to each registered voter in the city asking whether or not the city should purchase a new fire truck. All polls that are returned form the sample.

3. Is the data discrete or continuous?

a. The number of mugs of coffee consumed in a single day.

b. The volume of a mug, in milliliters

4. A population consists of the 7,232 invoices produced by a supplier. The business manager

collects a sample to study the percentage of invoices that are paid late. What sampling method is described below?

a. Invoices are sorted by the date they are due. Two invoices with each due date are randomly selected to be in the sample.

b. Invoices are arranged in the order in which the corresponding order was shipped. Every 10th invoices is selected to be in the sample.