Unit Test — Unit test Answers

Chin researched the amount of money 150 students earned per month from jobs held during the summer. He created a table of six sample means from his collected data. Sample NumberSample Mean ($)120822353245420752056210Using his results, what is a valid prediction about the mean of the population?

Liliana wants to start a seventh-grade computer club at Hamden Middle School. She surveyed 20 seventh-grade students at the town park. She asked each student how many hours they spend on their computers each week. She obtained the following results.8, 15, 0, 11, 12, 13, 16, 13, 0, 4, 17, 14, 30, 13, 5, 12, 1, 13, 12, 21What is the ratio of the total number of students who used their computers to the total number of students surveyed?

Scientists are studying hurricanes to determine the number of hurricanes in the past 50 years that have caused greater than $1 million in damages. Which best describes the population?

When Henry surveyed 45 seventh-grade students at random in the school cafeteria, he found that 3 out of 15 liked reggae music. Using proportional reasoning, about how many of the 180 seventh-grade students in his school like reggae?

The dot plots below show rainfall totals in the Highlands and Lowlands areas of a certain region.When comparing the two sets of data, which is a true statement?

The box plots show the weights, in pounds, of the dogs in two different animal shelters.One-half of the dogs in each shelter are between which weights?

Monique manages wildlife samples for Ducks Unlimited. Two samples of duck populations at a migratory site are shown in the table below. Which statement about the samples is true?Duck Pond SamplesSample 1Sample 2Mallard17Mallard21Wood Duck8Wood Duck7Green Wing Teal10Green Wing Teal8American Widgeon5American Widgeon6

The box plots show Theo’s math scores and language arts scores.MathLanguage ArtsAbout 50% of Theo’s scores are in which range for each subject?

A random sample of people is chosen to participate in a survey. For the survey results to be considered valid, which must be true of the random sample?

School newspaper staff went to three different sports games to survey students on their favorite sport, and the results are shown in the table below. Are these samples biased? Why or why not?Favorite Sport SurveySample 1Sample 2Sample 3Basketball23Basketball1Basketball1Football2Football24Football2Volleyball0Volleyball0Volleyball22

Which best describes a random sample?

A nutritionist wants to know how the taste of artificial sweeteners impacts food choices of diabetic patients. From which group would it be best to take a sample?

Lorenzo’s test scores are shown below. Lorenzo’s Test ScoresAnika’s test scores are shown below.Anika’s Test ScoresWhich statement compares the shape of the two dot plots?

Jillian and Dawn are playing a game of miniature golf. In this game, the score on a hole is the number of putts it takes to get the ball into the hole. The winner is the player with the lowest score. After playing 18 holes, Jillian’s mean is 2.4 and Dawn’s mean is 3.3. Which explains who won the game?

Ms. Sanchez’s students were asked how many hours they spend participating in organized sports each week. Each row of the table represents one sample from the class. Number of Hours Playing Sports55306224523430140436What is the mean of the sample in the third row?

The means and mean absolute deviations of Sidney’s and Phil’s grades are shown in the table below.Means and Mean Absolute Deviations of Sidney’s and Phil’s Grades SidneyPhilMean8278Mean Absolute Deviation3.283.96Which expression represents the ratio of the difference of the two means to Sidney’s mean absolute deviation?

A researcher wants to develop a product for families who have small children. He needs to determine if there is a nationwide interest in a toy that will help children describe their emotions. He asks only a sample of the population to complete his survey. What should be true of the sample so that the results of the survey can be used to predict the results of surveying the population?

Biologists are studying tropical plants to determine how far north each type of plant can survive. What is the population?

Which statement illustrates a simulation that could be used to generate samples of people on a game show selecting either door A, door B, or door C?

Mr. Sanchez surveyed classes to aid in planning the end-of-year party. For the first sample, Mr. Sanchez surveyed every third person on each first-period class roster. For the second sample, Mr. Sanchez surveyed his five honors math classes. Which statement about Mr. Sanchez’s samples is true?End-of-Year Party SurveySample 1Sample 2Water Park21Water Park36Bowling/Arcade36Bowling/Arcade28Zoo16Zoo24Dance & Dinner27Dance & Dinner12