Question 8.22

8.22 Nonconforming switches

In Example 5.5 (pages 247248), we calculated some binomial probabilities for inspection of a batch of switches from a large shipment of switches. Suppose that in an SRS of 150 switches, we have 10 failures.

  1. Find the sample proportion.
  2. What is the margin of error for 95% confidence?
  3. Find the 95% confidence interval for the proportion of nonconforming switches in the large shipment from which the SRS was selected.

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