Multiple Samples

Question 1

Braden wants to compare the types of ducks in two nearby ponds. He collected two samples using the following criteria. For sample 1, he counted the types of ducks on Walden Pond from 6 A.M. to 9 A.M. For sample 2, he counted the number of Mallard ducks that were on Brook’s Pond from 12 P.M. to 3 P.M. What would improve Braden’s plan? Select three options.

Revolt · Accepted Answer

Braden should sample the ducks on each pond at the same time of day because animals are active at different times.; Braden should sample twice at each pond if he wants to make sure each sample is representative of the population.; Braden should count more than Mallard ducks on Brook’s Pond if he wants to compare the types of ducks on each pond.

Question 2

Eldrick 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 2Mallard21Mallard8Wood Duck4Wood Duck17Green Wing Teal9Green Wing Teal15American Widgeon6American Widgeon0

Revolt · Accepted Answer

Eldrick should take another sample because there is too much variability in the two samples.

Question 3

Abigail wants to determine which time of day people prefer to exercise. She will collect three samples. Which statements describe good methods for collecting the samples? Select three options.

Revolt · Accepted Answer

Go to a local mall and survey people because a variety of people go to the mall.; Go to a grocery store and survey people because almost everyone shops for groceries.; Survey people at different times of the day to ensure she reaches people on different schedules.

Question 4

A sample was taken of dogs at a local dog park on two random days. The counts are displayed in the table below. If there are estimated to be 50 dogs at the park at any given time, which proportion could be used to find the average number of shepherd mixes at the park at any given time?Dog Park SampleSample 1Sample 2Labrador Retriever4Labrador Retriever5Shepherd Mix7Shepherd Mix9Chihuahua3Chihuahua5Poodle1Poodle2Australian Cattle Dog2Australian Cattle Dog4

Revolt · Accepted Answer

StartFraction 8 over 21 EndFraction = StartFraction x over 50 EndFraction

Question 5

DeWayne wants to find out what career his fellow middle school students would like to pursue. He plans to collect three samples. Which statements describe good methods for collecting the samples? Select two options..

Revolt · Accepted Answer

Interview students at lunch because it is likely that students with different interests will be present.; Interview students in English class because everyone has to take English, and he can reach a variety of students.

Question 6

The table displays the number of butterflies collected in a sample over three years. What inferences can be made from the samples taken on butterfly populations? Select three choices.Louden County Butterfly CountYear 1Year 2Year 3Zebra Swallowtail21Zebra Swallowtail10Zebra Swallowtail10Viceroy3Viceroy4Viceroy3Painted Lady2Painted Lady0Painted Lady16Monarch82Monarch52Monarch57

Revolt · Accepted Answer

The Viceroy population remained fairly steady over the three years recorded.; The average number of Zebra Swallowtails over all three samples will be less than the number recorded in year 1.; If a population is increasing over time, the average will be less than the most recent count.

Question 7

Student representatives surveyed their classmates on their preference of a school mascot for a new school. The results are shown in the table below. Which pair of samples seems most representative of student preference?Mascot SurveySample 1Sample 2Sample 3Artichokes15Artichokes0Artichokes3Bears28Bears53Bears48Citizens17Citizens7Citizens9

Revolt · Accepted Answer

Sample 2 and sample 3 are most representative because the relationship between preferences is consistent.

Question 8

Two samples were taken of fish caught on Small Lake and are shown in the table below. It is estimated that the Small Lake fish population is roughly 1,000 fish. What is the average number of brown trout in the lake?Small Lake Fish SampleSample 1Sample 2Rainbow Trout15Rainbow Trout11Brown Trout3Brown Trout1Largemouth Bass9Largemouth Bass11

Revolt · Accepted Answer

80

Question 9

Josiah kept track of how many songs of each genre were played in an hour from his MP3 player. The counts are displayed in the table below. He has a total of 1,500 songs on his player. Josiah predicted the number of rock songs on his MP3 player to be 300 songs. Which statements about his solution are true? Select three choices.Josiah’s MusicSample 1Sample 2R & B5R & B4Pop4Pop3Classical3Classical5Jazz2Jazz4Rock6Rock4Josiah’s work:

Revolt · Accepted Answer

He should have found the average of the number of rock songs by averaging 4 and 6 to get 5.; He did not multiply the numerator and denominator by the correct number to equal 1,500.; He should have multiplied the numerator and denominator by 75, not 30, because .

Question 10

The owner of a local restaurant surveyed her staff on their preference of uniform color. The results are displayed in the table below. Which pair of samples is most representative of the preference of all the staff?Uniform Color SurveySample 1Sample 2Sample 3Beige3Beige12Beige7Blue7Blue5Blue15Black10Black3Black18

Revolt · Accepted Answer

Sample 1 and sample 3 are most representative because the relationship between preferences is consistent.

Multiple Samples Answers

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