Inferences
Flashcard
•
Mathematics
•
7th Grade
•
Practice Problem
•
Hard
+1
Standards-aligned
Wayground Content
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9 questions
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1.
FLASHCARD QUESTION
Front
Is the inference "4 out of 5 doctors prefer Brand X medicine" valid based on a survey of 5 doctor friends?
Back
No, because the doctors asked are not a representative sample of the population of doctors.
Tags
CCSS.7.SP.A.1
CCSS.HSS.IC.A.1
2.
FLASHCARD QUESTION
Front
Whose inference is more reliable when surveying novel preferences: Shantel's systematic sampling (21% prefer romance) or Syrus's convenience sampling (48% prefer romance)?
Back
Shantel
Tags
CCSS.7.SP.A.1
CCSS.HSS.IC.A.1
3.
FLASHCARD QUESTION
Front
Maria collects data from a random sample of 7th graders in her school and finds that 16 out of 20 7th graders participate in after-school activities. How many students should Maria expect to participate in after-school activities if 240 total 7th graders attend Maria's school?
Back
192
Tags
CCSS.7.RP.A.3
4.
FLASHCARD QUESTION
Front
A movie theater randomly samples the types of admission tickets sold on Friday in the afternoon and the evening. If 400 tickets are sold on a Friday afternoon, use your inference and proportional reasoning skills to determine how many of those 400 tickets would be adult tickets.
Back
80
Tags
CCSS.7.RP.A.3
5.
FLASHCARD QUESTION
Front
Trinity asked a random sample of 50 students if they brought lunch from home today. If 30 answered “yes,” about what percent of students at Trinity’s school brought lunch from home today?
Back
60%
Tags
CCSS.7.SP.A.2
6.
FLASHCARD QUESTION
Front
Best sampling method to estimate mean word count per page in a 180-page book? Options: Count the words on one randomly chosen page; Calculate the mean word count for a sample consisting of the pages with pictures; Calculate the mean word count for a sample of 20 pages selected by choosing every 9th page; Calculate the mean word count for a sample consisting of the 10 pages that appear to have the most words.
Back
Calculate the mean word count for a sample of 20 pages selected by choosing every 9th page.
Tags
CCSS.7.SP.A.1
CCSS.HSS.IC.A.1
7.
FLASHCARD QUESTION
Front
Predict the number of purple jellybeans in a bag of 200 total jellybeans if a random sample of 25 resulted in 4 purple jellybeans.
Back
32
Tags
CCSS.7.SP.A.2
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