We included HMH Into Math Grade 7 Answer Key PDF Module 12 Review to make students experts in learning maths.
HMH Into Math Grade 7 Module 12 Review Answer Key
Vocabulary
Dana wants to know how many students at her school watch sports on television. She selects 40 students from her school to survey. Use this information to answer each question.
Question 1.
What is the population in this situation?
Answer:
Question 2.
What is the sample?
Answer:
Question 3.
What is the difference between a representative sample and a biased sample in this situation?
Answer:
Concepts and Skills
Question 4.
A theater owner wants to survey the audience about the types of plays they want to see. At a sold-out show, there are 100 people in VIP seats, 700 on the main floor, and 400 in the balcony. Which sample can best help the owner see the preferences of all the audience members?
(A) 5 people in VIP seats, 20 on the main floor, and 35 in the balcony
(B) 5 people in VIP seats, 35 on the main floor, and 20 in the balcony
(C) 20 people in VIP seats, 20 on the main floor, and 20 in the balcony
(D) 10 people in VIP seats, 7 on the main floor, and 4 in the balcony
Answer:
Question 5.
Use Tools There are 580 students at Alejandro’s school. He surveys a random sample of 60 students and finds that 21 of them regularly bring their lunch. Based on these results, estimate how many students at Alejandro’s school regularly bring their lunch. State what strategy and tool you will use to answer the question, explain your choice, and then find the answer.
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Question 6.
A city librarian wants to see if visitors want to add a cafe to the library. On a Monday morning, the librarian surveys every fourth visitor to the library. Is this sample likely to be representative of all library visitors? Explain.
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Question 7.
A factory produces a batch of 4,800 pens. The company dictates that if a random sample of the batch shows that more than 2% of the pens are defective, the batch needs additional testing. A worker checks a random sample of 60 pens from the batch and finds that 2 are defective. Based on this information, which statement(s) about the sample are true? Select all that apply.
(A) It indicates the batch needs additional testing.
(B) It indicates probably about 96 pens in the batch are defective.
(C) It indicates there are probably about 160 defective pens in the batch.
(D) It indicates probably about 4,580 pens in the batch have no defects.
(E) It indicates that about 1.25% of the pens in the batch are defective.
Answer:
Question 8.
A company makes short-sleeved and long-sleeved T-shirts. The company checks a random sample of 60 T-shirts of each type. It finds that 4 short¬sleeved shirts have problems and 1 long-sleeved shirt has problems. How many T-shirts should the company predict have problems in a shipment of 3,000 shirts of each type?
_____________ total T-shirts
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Question 9.
An inspector takes 20 different random samples of 25 apples each from a shipment of 2,000 apples. Based on the data, which is the most reasonable prediction of the number of apples in the shipment that weigh more than 7 ounces?
(A) about 200 apples
(B) about 320 apples
(C) about 520 apples
(D) about 560 apples
Answer:
Given,
An inspector takes 20 different random samples of 25 apples each from a shipment of 2,000 apples
The number of apples weighs more than 7 ounces.
3 + 1 = 4
4/25
2000 × 4/25 = 80 × 4 = 320
Option B is the correct answer.
Question 10.
Karen and Zeb each use a computer program to randomly select 50 students from the school directory. They ask the students about the school rules. They find that 68% from Karen’s sample and 72% from Zeb’s sample say the rules are fair. Explain why Karen and Zeb likely got different results, even, though they used the same sampling method.
Answer: