A new product is being tested by Zed Electronics to determine if it will continue to operate in a stable fashion under a variety of conditions. A sample of 400 items were tested, and 60 failed the test. Determine a 90 percent confidence interval for the population proportion.
- 0.2301 to 0.5301
- 0.1206 to 0.1794
- 0.1271 to 0.1729
- 0.1321 to 0.1679