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Common Core Standard 7.SP.A.2 Questions

Use data from a random sample to draw inferences about a population with an unknown characteristic of interest. Generate multiple samples (or simulated samples) of the same size to gauge the variation in estimates or predictions. For example, estimate the mean word length in a book by randomly sampling words from the book; predict the winner of a school election based on randomly sampled survey data. Gauge how far off the estimate or prediction might be.

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Grade 7 Collecting and Interpreting Data CCSS: 7.SP.A.2
A scientist wants to find the pH of a lake. What number of samples will provide him with the most accurate estimate of the lake's pH?
  1. One sample from a random part of the lake
  2. Two samples from opposite ends of the lake
  3. One sample from the middle of the lake
  4. Six sample takes from random parts of the lake
Grade 7 Collecting and Interpreting Data CCSS: 7.SP.A.2
A team of astronomers are trying to find out the number of red giant stars in a certain constellation. Which number of samples will give them the most accurate results?
  1. 4 samples from areas outside the constellation
  2. 4 samples from the areas with the most stars
  3. 4 samples from random parts of the constellation
  4. 4 samples from the areas with the least stars

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