Exploring 7th Grade Statistics

Why is it important for a sample to be representative of the population?

• So the results are easier to calculate

• So the results can be generalized to the whole population

• So the sample is smaller

• So the sample is larger

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Colton polled 22 people at the town senior center. Is this a random sample of the town residents?

• yes

• no

Tags

CCSS.HSS.IC.B.3

Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?

• thirty students who are often tardy

• thirty students who are rarely tardy

• thirty of her friends

• thirty randomly selected students from her school

Tags

CCSS.RI.7.1

CCSS.RI.7.8

CCSS.RI.8.1

CCSS.RL.7.1

CCSS.RL.8.1

A travel club has 3,000 members. A random sample of 50 of the club members found that 12 people like mountain vacations best. Which statement is NOT supported by the sample data?

• Twenty-four percent of those sampled say they like mountain vacations best.

• An estimated 720 club members would likely say they enjoy mountain vacations best.

• Almost one-quarter of club members would likely say they enjoy mountain vacations best.

• More than 2,500 club members would likely say they prefer other vacations over mountain vacations.

Tags

CCSS.7.SP.A.2

How many people watched more than 6 hours of TV?

• 10

• 5

• 20

• 17

Tags

CCSS.6.SP.B.4

CCSS.HSS.ID.A.1

If 300 students were polled...

• 100

• 150

• 250

• 200

Tags

CCSS.7.SP.A.2

Which statement is true about using multiple random samples of the same size from a population?

• All samples will always give the same result.

• The results from each sample may vary, but should be similar if the samples are random.

• The results from each sample will be completely different.

• Only the first sample matters.

Tags

CCSS.7.SP.A.2

What percent of the students sent between 40 and 59 text messages?

• 45%

• 25 text messages

• 45 text messages

• 25%

Tags

CCSS.6.SP.B.4

CCSS.HSS.ID.A.1

The number of 8-ounce glasses of water Shane drank each day for 12 days is represented in this histogram. Based on the given histogram, which statement must be true?

• On exactly 2 of these days, Shane drank 1 to 2 glasses of water.

• On exactly 3 of these days, Shane drank 7 to 8 glasses of water.

• On exactly 25% of these days, Shane drank 3 to 4 glasses of water.

• On exactly 60% of these days, Shane drank 5 to 6 glasses of water.

Tags

CCSS.6.SP.B.4

CCSS.HSS.ID.A.1

Which statement correctly describes the shapes of the dot plots for cars and SUVs?

• SUVs: symmetrical; Cars: skewed left

• Both are skewed left

• Both are symmetrical

• SUVs: skewed right; Cars: Skewed left