11-1 and 11-2 Stats Questions and Sampling Methods

True or False? The question “How far do Americans walk to school?” is a statistical question.

• True

• False

Darren measures the heart rate of 10 randomly selected students in his Algebra 2 class. What is the population? What is the sample?

• The Algebra 2 class is the population and the 10 randomly selected students are the sample.

• The Algebra 2 class is the population and the high school is the sample.

• The Algebra 2 class is the sample and the 10 randomly selected students are the population.

• The high school is the population and the Algebra 2 class is the sample.

The Pew Research Center states that “24% of teens go online almost constantly.” Is this a parameter or a statistic? Why?

• Parameter; it describes the teen population.

• Statistic; it describes a sample of teens.

• Parameter; it describes a sample of teens.

• Statistic; it describes the teen population.

Students ask every 5th person to board the train what their favorite color is. Which type of study method is described in each situation?

• observational study

• sample survey

• experiment

Researchers randomly choose two groups from 15 volunteers. Over a period of 9 weeks, one group watches television before going to sleep, and the other does not. Volunteers wear monitoring devices while sleeping, and researchers record dream activity. Which type of study method is described in each situation?

• experiment

• observational study

• sample survey

Sheri is designing an experiment to determine the effective dosage level of a new pain medication. How could she design her experiment?

• Use only males or females.

• Measure vitals and level of pain of each participant.

• Randomly assign participants to one of 4 groups: control, level 1, level 2, and level 3. Measure vitals and level of pain of each participant to compare the results at the end of the treatment period. Control group: no pain medication, Levels 1-3: increasing doses of pain medication.

• Assign participants by their level of pain to one of 4 groups: control: no pain, level 1: light pain, level 2: medium pain, and level 3: high pain. Measure their pain levels after the treatment.

Which of the following is an example of a categorical variable?

• the weight of a backpack

• the proportion of backpacks that weigh more than 50 pounds

• the type of backpack used

• the number of books in a backpack

All the residents of a building were polled about whom they would vote for in the upcoming city election for comptroller. What are the sample and the population in this poll?

• The population is the residents of the building; the sample is the residents who responded.

• The population is the registered voters in the city; the sample is the residents of the building.
  

• The population is the residents of the building; the sample is the registered voters in the city.
  

• The population is the registered voters in the city; the sample is a random sample of the residents of the building.

A census reports that the mean retirement age is 68.3 years. In a random sample, the mean retirement age is 65.8 years. What is the mean of 65.8 years?

• a parameter

• a statistic

• a variable

• a sample

Which of the following types of sampling are less likely to be biased?

• cluster, stratified, and systematic

• stratified, convenience, and self-selected

• self-selected, cluster, and convenience

• systematic, cluster, and self-selected