Unit Test Answers

A researcher wants to survey people from different age groups to analyze voting patterns. Which type of survey will best accomplish this goal?

Kai, a seventh grader, wants to determine the average number of times the families in his neighborhood visit the pool during the summer. He samples the families of four of his classmates. Which improvements could Kai make to his sample to increase the validity of the results? Select three choices.

A utility company hires pollsters to knock on random doors in different parts of town to survey residents about the cost of their electric bill. Would this study be biased? Why or why not?

If Benito is selecting samples of five values from the table, which row will result in the greatest mean?Population DataRow 142233Row 233432Row 324343Row 434473

An employer asks the survey question “How much money do you spend on gasoline per week to get to work?” of her employees that drive to work. Which best describes why she chose to only ask the employees that drive to work rather than all of her employees?

Kristin wants to ask the managers of the fast food restaurants in a large city “How do you retain employees?” What condition must be true to justify surveying only a sample of the managers instead of surveying the entire population of managers?

Lawrence performs a survey to determine the average number of minutes of exercise seventh-grade athletes get in one week. He gets a list of sports and the seventh-grade students participating in each sport. He then chooses 10 people from each list to complete the survey. How can Lawrence’s sample be improved to be more representative of the population?

The student government at the local middle school surveyed students to help plan the end-of-year party. For the first sample, they surveyed every other person at sports practice after school. For the second sample, they surveyed every fifth person entering the cafeteria where all students eat. Which statement about the samples is true?End-of-Year Party SurveySample 1Sample 2Water Park21Water Park36Bowling/Arcade36Bowling/Arcade28Zoo16Zoo24Dance & Dinner27Dance & Dinner12

A town’s athletic league contains 18 baseball teams. The board members of the league want to survey adults attending games to determine if they believe the athletes are showing good sportsmanship. The board members attended one game and surveyed an equal number of adults supporting each of the two teams. Which best explains the validity of the results?

When is choosing a sample from a population least likely to be appropriate? Select two options.

Marisa recorded the number of hours she babysat each day last summer. She plotted the data in the box plot.

The wildflower commonly known as Ute Ladies’ Tresses is threatened. Some sample counts were taken of local populations of the flower as part of monitoring and protecting its population. These counts are displayed in the table below. What is the average number of plants at site 2 for both samples?Ute Ladies’ Tresses Mature Plant Count 20102012Site 18464Site 2112120

Voluntary sampling is one type of sampling method that is not probability based. This means that

Vickie conducts a survey of home builders to determine the average cost of building a new home. She samples 10 home builders who are building in the town in which she lives. Under which conditions will her sample be a representative sample? Select two options.

The student government wants to determine the theme for the eighth-grade dance. Which group would it be best to take a sample from?