Refer to the IEICE Transactions on Information A Systems (Jan. 2005) experiment

Question

Refer to the IEICE Transactions on Information A Systems (Jan. 2005) experiment to monitor the impedance to leg movements. Exercise 2.46 (p. 51). Recall that engineers attached electrodes to the ankles and knees of volunteers and measured the signal-to-noise ratio (SNR) of impedance changes. For a particular ankle-knee electrode pair, a sample of 10 volunteers had SNR values with a mean of 19.5 and a standard deviation of 4.7. Form a 95% confidence interval for the true mean SNR impedance change. Interpret the result. (16.14, 22.86)

Explanation / Answer

alpha / 2 = 0.025 df = 9 t= 2.262

I: 19.5 +/- 2.262 * 4.7 / srqt (10)

19.5 +/- 3.36

16.14 < miu < 22.86

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