Intro to Stats Midterm Practice 1

A poll is conducted of 1000 high school graduates from around the country to determine postsecondary plans.

What is a parameter in this situation?

• The percentage of the 1000 HS graduates who are going to college

• The percentage of all HS graduates who are going to college

• The 1000 HS graduates being surveyed

• The number of all HS graduates in the country

Suppose a restaurant is trying out some new menu items. They gather verbal feedback from their patrons by asking the question, "How do you like it?"

How could the restaurant change its data collection to allow them to do statistical calculations, such as mean and standard deviation?

• Have patrons write their responses down rather than give them verbally

• Have patrons rate menu items on a scale from 1 to 5

• Serve the new menu items at a different restaurant for comparison

• Publish reviews of food online

Data is collected on all the newborn babies born in a particular month at Butterworth Hospital. Birthweight is recorded, along with gestational age.

There are two variables in this situation. Are they qualitative or quantitative?

• Both qualitative

• Both quantitative

• One qualitative, one quantitative

• Impossible to tell from given info

Which of the following variables is qualitative (categorical)?

• height

• GPA

• color

• hours

Based on data collected on the number of tuberculosis cases in the mountain states, the following conclusions are drawn. Which one is NOT inferential?

• Arizona had the largest number of cases.

• There is almost no risk of contracting tuberculosis in Wyoming.

• New Mexico's healthcare system is not properly addressing this disease.

• Idaho is safer than Nevada.

USA Today conducted a Gallup poll of 1433 adults nationwide. One of its findings revealed that 45% of poll participants feared that they might not be able to pay for their healthcare costs for the next 12 months.

What population does this sample represent?

• The worldwide adult population

• Adults who are currently hospitalized

• The adult population of the United States

• People in Michigan who do not have health insurance.

The Wall Street Journal reported on a Dutch experiment that indicated that coffee brewed using the steeping method tends to raise blood cholesterol levels. 100 volunteers participated in the study, and their cholesterol levels were measured weekly.

What is the variable in this situation?

• the coffee

• cholesterol levels

• the 100 participants

• the Wall Street Journal

The Wall Street Journal reported on a Dutch experiment that indicated that coffee brewed using the steeping method tends to raise blood cholesterol levels. 100 volunteers participated in the study, and their cholesterol levels were measured weekly.

The 100 volunteers are referred to as:

• the population

• the sample

• a parameter

• a statistic

A collection of ALL people you want to survey to gain information about.

• Population

• Sample

• Parameter

• Statistic

A small group of the total population that you want to survey

• Population

• Sample

• Parameter

• Statistic