Probability and Sampling

Multiple Select

Suppose you are interested in learning about how much time seventh-grade students at your school spend outdoors on a typical school day. Select **all** the samples that are a part of the population you are interested in.

• The 20 students in a seventh-grade math class.

• The first 20 students to arrive at school on a particular day.

• The seventh-grade students that participate in a science fair put on by the four middle schools in a school district.

• The 10 seventh graders on the school soccer team.

• The students on the school debate team.

Multiple Choice

For the sample given, which of the following are possible populations they could belong to: The prices for apples at two stores near your house.

• Prices of oranges at the same stores
• Prices of apples in a different city
• Prices of bananas at local markets
• Local apple prices or specific store apple prices

Multiple Choice

For the sample given, which of the following are possible populations they could belong to: The days of the week the students in your math class ordered food during the past week.

• Any day of the week (Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday)
• Only weekdays (Monday to Friday)
• Only weekends (Saturday and Sunday)
• Holidays throughout the year

Multiple Choice

For the sample given, which of the following are possible populations they could belong to: The daily high temperatures for the capital cities of all 50 U.S. states over the past year.

• Daily low temperatures for capital cities in the U.S. over the past year.
• Daily high temperatures for all cities in Canada over the past year.
• Average daily temperatures for all U.S. states over the past year.
• Daily high temperatures for all capital cities in the U.S. over the past year.

Multiple Choice

A doctor suspects you might have a certain strain of flu and wants to test your blood for the presence of markers for this strain of virus. Why would it be good for the doctor to take a sample of your blood rather than use the population?

• Blood samples are not necessary for flu diagnosis.
• Population data is always more accurate than individual tests.
• It provides specific information about your individual immune response and the presence of the virus.
• It is easier to analyze data from a large group of people.

Multiple Choice

Data collected from a survey of American teenagers aged 13 to 17 is used to estimate that 29% of teens believe in ghosts. This estimate is based on data from 510 American teenagers. What is the population that people carrying out the survey were interested in?

• all people in the United States

• the 510 teens that were surveyed

• all American teens who are between the ages of 13 and 17

• the 29% of the teens surveyed who said they believe in ghosts