Unit 1 Statistics Test

A local newspaper of a small town wants to find out if the mayor of the town is popular with its citizens. Which of the following samples should be used by the newspaper?

• A random sample of people from the mayor's political party

• A random sample of people selected from all adult citizens of the town

• A random sample of people selected from all people registered with a political party

• A random sample of people selected from all middle class citizens of the town

I want to find out how many people in my school like a certain brand of soda, so I watch what all of my friends drink. This is an example of a(n) _​ (a)   .

• Observational Study
• Double Blind Study
• Experiment
• Randomized Trial

A team of scientists is trying to find out what percentage of people in the United States have a little known medical condition. Which of the following sample groups is likely to be biased?

• A simple random sample of 2,000 subjects

• A convenience sample of 2,000 subjects

• A stratified random sample of 1,500 subjects

• A systematic random sample of 3,000 subjects

An interviewer is trying to prove a point for his video. If he interviews 2 people in total, will he have an accurate representation of the opinions of a group of 200 people?

• Only if he chose people who were not biased

• Only if he picked the 2 people at random

• Yes, 2 people can speak for any population

• No, the sample is too small to be reliable

Which of the following are the two major branches of statistics?

• Individual & Variable

• Discrete & Continuous

• Qualitative & Quantitative

• Descriptive & Inferential

In a survey about new bike paths, which group is least likely to be a biased sample?

• randomly chosen voters

• randomly chosen drivers

• randomly chosen bikers

• randomly chosen people exercising

Which of the following is NOT a reason why samples are used in statistics?

• to save money

• to save time

• to make the collection of data easier

• to include all individuals in the study

Which of the following is an example of systematic sampling?

• In a large school district, all teachers from two buildings are interviewed to determine whether they believe the students have less homework to do now than in previous years.

• Every seventh customer entering a shopping mall is asked to select his/her favorite store.

• Nursing supervisors are selected using random numbers in order to determine average annual salaries.

• Mail carriers of a large city are divided into four groups according to gender and according to whether they walk or ride on their routes. Then 10 are selected from each group and interviewed to determine whether they have been bitten by a dog in the last year.

Why is a random sample more likely to provide the most accurate results?

• Because it can represent more people

• Because the randomization causes balance

• Because it eliminates the possibility of bias

• Because samples are short and sweet

Classify by sampling method used. Number all the blocks in the city and use a random number generator to select the city blocks to include the sample.

(a)  

• Random
• Systematic
• Stratified
• Convenience