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Suppose we wish to estimate the mean systolic blood pressure in a single target population. We...

  1. Suppose we wish to estimate the mean systolic blood pressure in a single target population. We select a sample of size n = 3539, find the sample mean, x = 127.3, and the sample standard deviation, s = 19.0. To find a 95% confidence interval, we see that tc = 1.96, and then are able to compute E = 0.63. What is the 95% confidence interval, stated in the correct context?

  2. Why did we use tc instead of zc in the problem above?

Math   Statistics-And-Probability   
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