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Inference from Sample Statistics

Math · Problem-Solving and Data Analysis · 20 questions · every one comes with a full explanation.

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  1. 1In a study of cell phone use, 799 randomly selected US teens were asked how often they talked on a cell phone and about their texting behavior. The data are summarized in the tableHard · Problem-Solving and Data Analysis
  2. 2There are 55 students in Spanish club. A sample of the Spanish club students was selected at random and asked whether they intend to enroll in a new study program. Of those surveyEasy · Problem-Solving and Data Analysis
  3. 3A researcher interviewed 411 randomly selected US residents and asked about their views on the use of nuclear energy. The table above summarizes the responses of the interviewees. Hard · Problem-Solving and Data Analysis
  4. 4A city has 50 city council members. A reporter polled a random sample of 20 city council members and found that 6 of those polled supported a specific bill. Based on the sample, whEasy · Problem-Solving and Data Analysis
  5. 5A study was done on the weights of different types of fish in a pond. A random sample of fish were caught and marked in order to ensure that none were weighed more than once. The sMedium · Problem-Solving and Data Analysis
  6. 6A park ranger asked a random sample of visitors how far they hiked during their visit. Based on the responses, the estimated mean was found to be 4.5 miles, with an associated margMedium · Problem-Solving and Data Analysis
  7. 7A sample consisting of 720 adults who own televisions was selected at random for a study. Based on the sample, it is estimated that 32 % of all adults who own televisions use theiMedium · Problem-Solving and Data Analysis
  8. 8A random sample of 50 people from a town with a population of 14,878 were asked to name their favorite flavor of ice cream. If 7 people in the sample named chocolate as their favorEasy · Problem-Solving and Data Analysis
  9. 9A bag containing 10,000 beads of assorted colors is purchased from a craft store. To estimate the percent of red beads in the bag, a sample of beads is selected at random. The percMedium · Problem-Solving and Data Analysis
  10. 10The results of two random samples of votes for a proposition are shown above. The samples were selected from the same population, and the margins of error were calculated using theHard · Problem-Solving and Data Analysis
  11. 11From a population of 50,000 people, 1,000 were chosen at random and surveyed about a proposed piece of legislation. Based on the survey, it is estimated that 35 % of people in thMedium · Problem-Solving and Data Analysis
  12. 12A certain forest is 253 acres. To estimate the number of trees in the forest, a ranger randomly selects 5 different 1-acre parcels in the forest and determines the number of trees Easy · Problem-Solving and Data Analysis
  13. 13At a large high school, 300 students were selected at random and were asked in a survey about a menu change in the school cafeteria. All 300 students completed the survey. It was eEasy · Problem-Solving and Data Analysis
  14. 14Based on a random sample from a population, a researcher estimated that the mean value of a certain variable for the population is 20.5 , with an associated margin of error of 1 . Medium · Problem-Solving and Data Analysis
  15. 15In State X, Mr. Camp's eighth-grade class consisting of 26 students was surveyed and 34.6 percent of the students reported that they had at least two siblings. The average eighth‑gHard · Problem-Solving and Data Analysis
  16. 16To estimate the proportion of a population that has a certain characteristic, a random sample was selected from the population. Based on the sample, it is estimated that the proporMedium · Problem-Solving and Data Analysis
  17. 17A store manager reviewed the receipts from 80 customers who were selected at random from all the customers who made purchases last Thursday. Of those selected, 20 receipts showed tMedium · Problem-Solving and Data Analysis
  18. 18In a study, the data from a random sample of a population had a mean of 37, with an associated margin of error of 3. Which of the following is the most appropriate conclusion that Easy · Problem-Solving and Data Analysis
  19. 19Poll Results Angel Cruz 483 Terry Smith 320 The table shows the results of a poll. A total of 803 voters selected at random were asked which candidate they would vote for in thHard · Problem-Solving and Data Analysis
  20. 20The town has a total of 6,000 voters. Based on the table, what is the best estimate of the number of voters who plan to vote for Candidate A?Medium · Problem-Solving and Data Analysis