O1C1-4 Statistics Basics

A beverage company wanted to see if people in the United States liked their new logo. Which choice best represents a population?

• A selection of logo artists.

• Every person in the United States.

• A selection of shoppers from different states.

• 3,800 children age 5 - 15

In a survey of a sample of high school students, 43% said that their mother has taught them the most about managing money.

• parameter
• statistic

As of January 2007, 44% of the governors of the 50 states in the US are Republicans.

• parameter
• statistic

A car salesman records information about the cars he is selling.

The color of each car is _____ data

• Qualitative Nominal

• Quantitative Continuous

• Quantitative Discrete

• Qualitative Ordinal

The length of a football pitch is _____ data

• Discrete

• Continuous

You are designing a sampling plan for a survey of city governments in your state to find

out the amount of money they are spending on administrative salaries.

Decide which sampling method would be best.

• systematic sample

• Cluster sample

• Simple Random Sample (SRS)

• convenience sample

Interview every 10th student who enters the school in the morning.

• simple random

• voluntary response

• systematic

• convenience

An independent research company wants to go door to door to survey people in the city of Fontana. The company decides to number all blocks within the city limit, randomly choose 1 block and survey all households on that block.

This is an example of:

• Simple Random Sample

• Stratified Random Sample

• Cluster Random Sample

• Systematic Random Sampling

Why do we want our samples to be random?

• To decrease the margin of error

• To increase our confidence

• To decrease variability

• To decrease bias

Many years ago, a New York Times Poll on women’s issues interviewed 1025 women randomly selected from the United States, excluding Alaska and Hawaii. One question was “Many women have better jobs and more opportunities than they did 20 years ago. Do you think women had to give up too much in the process, or not?” 48% of women in the sample said “Yes.”

What is the sample size for this survey?

• 1025

• American Adult Women

• American Adults

• 48%