6-Sampling and Probability Quiz

A school is conducting a survey to find out the favorite sport of its students. They randomly select 50 students from a total of 500. What is the main reason for using a random sample in this survey?

• To ensure that every student has the same favorite sport.

• To make sure the sample is representative of the entire student population.

• To save time by only asking a few students.

• To ensure that only the best students are surveyed.

Tags

CCSS.7.SP.A.1

A bag contains 3 red marbles, 2 blue marbles, and 5 green marbles. If you draw one marble at random, what is the probability that it is blue?

Tags

CCSS.7.SP.A.1

A researcher wants to estimate the average height of 7th-grade students in a large school. She takes a random sample of 30 students. Why might she take multiple samples of 30 students each?

• To increase the average height of the sample.

• To gauge the variation in the estimates of the average height.

• To ensure that only the tallest students are included.

• To make the sample size larger than the population.

Tags

CCSS.7.SP.A.2

A coin is flipped twice. What is the probability of getting two heads?

Tags

CCSS.7.SP.A.1

A tree diagram is used to show all possible outcomes of flipping a coin and rolling a die. How many outcomes are there in total?

• 6

• 8

• 12

• 10

Tags

CCSS.7.SP.A.1

A class of 30 students is surveyed to find out their favorite ice cream flavor. If 6 students prefer chocolate, what is the probability that a randomly selected student prefers chocolate?

Tags

CCSS.7.SP.A.1

A random sample of 100 people is surveyed to find out if they prefer tea or coffee. If 60 people prefer coffee, what inference can be made about the population?

• Most people in the population prefer tea.

• Most people in the population prefer coffee.

• The population is equally divided between tea and coffee.

• The sample is too small to make any inference.

Tags

CCSS.7.SP.A.2

A spinner has 4 equal sections colored red, blue, green, and yellow. If the spinner is spun twice, what is the probability of landing on red both times?

Tags

CCSS.7.SP.A.1

A tree diagram is used to show the possible outcomes of rolling two dice. How many outcomes are there in total?

• 12

• 18

• 24

• 36

Tags

CCSS.7.SP.A.1

A random sample of 50 students is taken to estimate the average number of hours they study per week. If the average from the sample is 10 hours, what can be inferred about the population?

• The average number of study hours for the population is exactly 10.

• The average number of study hours for the population is likely around 10.

• The population does not study at all.

• The sample size is too small to make any inference.

Tags

CCSS.7.SP.A.2