Population & Sample

Which class had the highest mean pacer?

• 1st

• 3rd

• 5th

Rounding to a whole number, what was the mean of 3rd period?

Russell randomly surveys 7th graders in his school and finds that 6 out of 30 attend summer camp. If there are 200 7th graders in his school, about how many are expected to attend summer camp?

(hint-set up a proportion)

Emily surveyed a random sample of 10 students from her science class about their favorite types of movies. 5 students liked sci-fi, 4 liked comedy, and 1 liked mystery.  Emily concluded that the most popular type of movie among students in the school is likely sci-fi. Is this a valid inference?

• yes

• no

What is Team A's Median?

Which team has the higher median?

• Team A

• Team B

Which Team has a wider variability?

(think range)

• Team A

• Team B

• They are the same.

The dot plots show how long it took the 20 students in Mr. Novick’s two math classes to finish their math homework last night.

What is the mean of first period?

The dot plots show how long it took the 20 students in Mr. Novick’s two math classes to finish their math homework last night.

What is the mean of 2nd period?

The dot plots show how long it took the 20 students in Mr. Novick’s two math classes to finish their math homework last night.

What can we conclude about the data?

• First period took longer to complete their homework

• Second period took longer to complete their homework

• Both classes took the same amount of time to complete their homework.