In order to help correctly price health insurance products, I want to get more data about the blood pressure of average Americans. To do so, I set up tables outside health clubs in the 50 largest American cities and take the blood pressures of volunteers entering and exiting the club over a week's period. This allows me to calculate a sample mean, sample standard deviation, and standard error. If I use the distribution of the sample to create confidence intervals or conduct hypothesis tests I'm likely to run into serious problems because: O I've introduced serious pseudo-sampling error into this process. O I've introduced serious extra-sampling error into this process. O I've introduced serious non-sampling error into this process. O I've introduced serious sampling error into this process.

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