Populations and Samples in Probability

_______ is a part of a group being surveyed.

• Sample

• Population

• Random Sample

• Quartile

_______ is the entire group of objects or individuals considered for a survey.

• Sample

• Population

• Random Sample

• Quartile

True or False: all samples lead to a good prediction about an entire population.

• True

• False

According to the table, what is the relative frequency of students ages 10 - 13 who eat breakfast?

• About 33%

• About 50%

• About 40%

• About 44%

As part of a 6th grade statistics project, the teacher brings a candy jar full of gumballs (red & green). The assignment is to estimate the proportion of red gumballs in the jar. Suppose one of the students draws 25 gumballs from the jar: 8 are red, 17 are green. What is the SAMPLE?

• 25 gumballs drawn

• all gumballs in the jar

• the students

• the 17 green gumballs

If the population is ALL 7th Graders

Then you want to take a sample from ALL 7th graders.

A sample is part of the population but not all of it.

Select the one below that is true

• A sample is a smaller group selected from the population

• A sample is the entire population

• A sample is a larger group than the population

• A representative sample is not related to the population

A toy store owner is tracking how much kids spend each month on toys. Which choice BEST represents a sample?

• All of the kids who buy toys.

• 275 rich kids

• 200 random kids of all ages

• 292 boys ages 7-15

A researcher needs to determine the number of samples he needs to conduct a survey in a population of 1 445 people. If the margin of error is at 1%, how many samples does he need (Use Slovin’s  Formula).

• 1263

• 94

• 10

• 313

The purpose of this process is to be able to draw conclusions about populations from smaller samples.

• Sampling

• Presenting

• Solving

• Collecting

Which of the following scenarios BEST describes the concept of sample?

• A psychologist who interviewed her patients with sleeping disorders

• V asked her friends to refer other possible respondent to answer the survey

• Jay surveyed 210 Grade 10 students to represent the whole Grade 10 students

• Ni-ki obtained the mean height of 176 cm among the 350 college students