Question 6.118

6.118 Change in number insured.

The Wall Street Journal reported a Rand study on the estimated change in insured Americans from September 2013 to March 2014.23 Here is an excerpt:

… a net gain of 9.3 million people with coverage. That number came with a wide margin of error (3.5 million people), was driven largely by increased employer-based coverage, and didn’t fully capture the surge in enrollments that occurred in late March as the application deadline for Obamacare plans neared.

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The reported margin of error is based on a 95% level of confidence. What is the 95% confidence interval for the change in people with coverage?