Unit 5 Study Guide - Inferences

A middle school with 2,700 students is considering changing the cafeteria menu. The school plans to first find out which meals the students prefer.

Which would be the BEST method for obtaining the information?

• Conduct a census of all of the teachers in the school.

• Survey every tenth student that enters the school.

• Ask students to respond to an email with their preferences

• Survey every fifth parent in the car rider line.

Carlos wants to create a team of classmates to represent his school.

Which of the following methods could he use to produce a random sample?

• Select students who made honor roll

• Select names from a box that has names of all students

• Select students who volunteer to be on the team

• Select the first 20 students who enter the band room

In a spot check of cartons of eggs, Matthew found that 5 out of 400 eggs were cracked. If the store has 5,000 eggs for sale, approximately how many can he expect to be cracked?

• 70

• 60

• 50

• 80

Out of 3,000 city residents selected at random, 510 residents were born in the 1980s. If the city has 700,000 residents, which of these is MOST LIKELY the number of city residents born in the 1980s?

• 191,000

• 119,000

• 19,000

• 510

The zoo took a survey to determine favorite exhibits of visitors. Suppose 375 people visit the zoo. Predict how many people will choose the lion exhibit as their favorite.

• 120

• 35

• 60

• 160

Which statement is true about the dot plots?

• All 3 measures of center are the same for dogs.

• All 3 measures of center are the same for cats.

• The range is the same for dogs and cats.

• All of these statements are true

Compare the median number of glasses for each girl.

• Emma's median was higher

• Paula's median was higher

• Paula and Emma had the same median

• It is not possible to compare their medians.

What can be inferred from the median of these data about the amount of television

parents watch versus the amount of television their children watch?

• The parents and children watch the same amount of TV

• The children watch about twice as much TV as the parents

• The children watch about 3 times as much TV as the parents

• The children watch about 4 times as much TV as the parents

Which of the following statements is true?

• The salad bar is more popular than the hot lunch

• The lower quartile of the hot lunch is the same as the upper quartile of the salad bar

• The range of the hot lunch is the same as the range of the salad bar.

• The median of the salad bar is greater than the median of the hot lunches

The following boxplots show the number of cookies eaten by students in our class.

Based on the boxplots, which of the following statements about the cookies eaten is

incorrect?

• 100% of the boys ate less cookies than 50% of the girls

• All of the girls ate at least one cookie

• 25% of the girls ate 5 or more cookies

• 75% of the boys ate 3 or fewer cookies