Population Sampling Inferences

_______ is a part of a group being surveyed.

• Sample

• Population

• Quartile

• Random Sample

What is the difference between a sample and a population?

• Populations only consider a portion of the sample being studied.

• Samples only consider a portion of the population being studied.

• Populations do not always represent the entire group of people in question.

• Samples are generally much larger than populations.

Mrs. Terrell wants to know 7th grade students' favorite tv show. She picks 20 students to ask. What is the sample?

• All students at HMS

• All students in her 1st period class

• The 20 students who get picked

• All students in 7th grade

Mr. Gibbs wants to know his advisory's favorite video game. He picks 5 students to ask. How should Mr. Gibbs pick his sample?

• Pick his favorite 5 students

• Randomly pick student names from a hat

• Pick only students who play Fortnite

• Pick 5 girls from Mrs. Wyatt's advisory

Mr. Gibbs finds that 3 out of 5 students in his sample pick Fortnite as their favorite video game. There are 10 students in Mr. Gibb's advisory. How many total students in his advisory would you expect to like Fortnite the most? (Hint: Find the percentage.)

• 3

• 5

• 6

• 10

Mrs. Wyatt wants to know her 5th period's favorite snack. She finds that 4 out of 10 students in her sample pick Takis as their favorite snack. There are 30 students in her 5th period. How many total students in her 5th period would you expect to like Takis the most? (Hint: Find the percentage.)

• 4

• 12

• 30

• 40

Jayden asked a random sample of 50 students at his school if they brought lunch from home today. If 30 answered “yes,” about what percent of students at Jayden’s school brought lunch from home today?

• 15%

• 30%

• 50%

• 60%

The entire set of people or objects that is being studied.

• Population

• Sample

• Sampling Plan

• Data Point

A researcher asked five of his doctor friends if they thought the new Brand X medicine that he developed was effective. Four responded "yes." The researcher used the results to write a TV advertisement claiming that "4 out of 5 doctors prefer Brand X medicine." Is this a valid inference? Explain.

• No, because the doctors asked are not a representative sample of the population of doctors.

• No, because 4 doctors said yes out of 9 who were asked.

• Yes, because the doctors asked are a representative sample of the population of doctors.

• Yes, because 4 doctors said yes out of the 5 who were asked.

Maria collects data from a random sample of 7th graders in her school and finds that 16 out of 20 7th graders participate in after-school activities. How many students should Maria expect to participate in after-school activities if 240 total 7th graders attend Maria's school? Write the numerical answer only.