Statistics Lessons 1-3

A principal randomly chooses 40 students from 7th grade. Of these students, 9 were wearing watches. Based on this information, what is the most reasonable prediction of the number of students wearing watches in a group of 120 students?

• 27

• 9

• 18

• 80

At an assembly 7 out of 10 students who entered the gym were carrying a backpack. Based on this information, if 700 students were at the assembly, how many students could be expected to be carrying a backpack?

• 49

• 490

• 210

• 421

Drake made 14 out of 20 free throw shots.  About how many out of the next 30 free throw shots would you expect him to make?

• 20

• 21

• 22

• 25

A poll was taken at South High School, 25 out of 30 students said they would prefer pizza on Fridays. Out of 1200 students, what is a reasonable prediction of how many students would prefer pizza on Fridays?

• 100

• 1000

• 10

• 1

A member of the cafeteria staff asks every fifth student leaving the cafeteria to rank 5 vegetables from most favorite to least favorite. She finds that corn is one of the favorite vegetables.

• Unbiased

• Biased

A real estate agent surveys people about their housing preferences at an open house for a luxury townhouse. He finds that most people prefer townhomes.

• Unbiased

• Biased

You want to find our what restaurant at the Food Court has the best food. You ask every 5th person who enters the Food Court.

• Unbiased

• Biased

To evaluate customer satisfaction, a grocery store gives double coupons to anyone who completes a survey as they enter the store. The store manager determines that customers are very satisfied with their shopping experience in his store

• Unbiased

• Biased

Explain why this graph may be misleading?

• the x-axis does not have equal intervals

• San Fransisco is not a real city

• you cannot have percents in a line graph

• the y-axis does not have equal intervals

What is misleading about this graph?
**choose the best answer

• Nothing is misleading about this graph.

• The democrats are too high.

• The y-axis does not start at zero, so it makes the democrats look much higher than the other two parties.