Unit 9 Study Guide

1. A grocery store polls every twentieth customer to determine if they are satisfied with the cleanliness of the store. Forty customers are surveyed, and 26 are satisfied. What conclusion can be drawn for the 800 daily customers?

• 65% of the customers are unsatisfied with the cleanliness of the store.

• Of the 800 customers, 520 would be satisfied with the cleanliness of the store.

• 40% of the customers are satisfied with the cleanliness of the store.

• 25% of the customers are not satisfied with the cleanliness of the store.

At the zoo, the length of each iguana is measured. Which statement is best supported by the information below?

• Over half of the iguanas measure 14 cm or more in length.

• 25% of the iguanas measure 12 cm in length.

• The number of iguanas that measure 15 cm or more is equal to the number that measure 11 cm or less.

Compare the two box plots below. Which of the following statements is NOT true?

• Class B has a higher median number of siblings.

• Class A has a greater variability in the number of siblings.

• Both Class A and Class B have students who are only children.

• Over half of the students in Class A have two or more siblings.

A random sample of 40 students from each grade level was surveyed regarding their preference for a class field trip. Use the table below to answer questions 4-5.

What percent of students surveyed preferred going to the zoo for their class field trip?

• 65%

• 17.5%

• 32.5%

• 15%

Based off the information in the table, which inference is true?

• 8th graders wanted to go to the zoo more than 7th graders wanted to go to the museum.

• More 8th graders than 7th graders wanted to go to the sports complex.

• 7th and 8th graders preferred going to the zoo over the museum and sports complex.

• More 8th graders wanted to go to the museum or sports complex than 7th graders wanted to go to the zoo or sports complex.

Two friends measure the distance a racecar travels over 10 trials. Use the data to answer questions 6-7.

Which of the conclusions best supports the dot plots?

• Both Jamal's and Kendall's racecars had an equal spread in their data.

• On average, Kendall's racecar traveled further.

• The median distance Jamal's racecar traveled was 6.5 ft.

• Both Jamal and Kendall had the same mode of data.

Two friends measure the distance a racecar travels over 10 trials. Use the data to answer questions 6-7.

Which of the following represents the shape of Kendall's data?

• Skewed Left

• Skewed Right

• Symmetric

• Skewed Symmetric

Mrs. Moore's and Mrs. Ruiz's classes are competing for the best scores on their math test. Use the box plots below to answer questions 8-9.

Which of the following statements does NOT represent the data?

• The scores in Mrs. Ruiz's class have less variability than the scores in Mrs. Moore's class.

• The median of Mrs. Moore's class is equal to the first quartile of Mrs. Ruiz's class.

• The interquartile range of both classes is equal.

• The scores in Mrs. Moore's class have a greater spread than the scores in Mrs. Ruiz's class.

Mrs. Moore's and Mrs. Ruiz's classes are competing for the best scores on their math test. Use the box plots below to answer questions 8-9.

Which of the following represents the difference in centers of Mrs. Moore's class and Mrs. Ruiz's class?

• 7

• 11

• 4

• 3

Data is collected from a random sample of 40 people at the public library. If the public library has 300 people, then which of the following conclusions can be drawn?

• Exactly 42% of the library patrons chose a mystery.

• Non-fiction and science fiction represent over half of the selections.

• Over 25% of the library patrons chose a science fiction book.

• 136 total patrons can be expected to choose a non-fiction book.