In an experiment to monitor the impedance to leg movement, Korean engineers attached electrodes to the ankles and knees of volunteers. Of interest was the signal-to-noise ratio (SNR) of impedance changes, where the signal is the magnitude of the leg movement and noise is the impedance change resulting from interferences such as knee flexes and hip extensions. For a particular ankle–knee electrode pair, a sample of 10 volunteers ad SNR values with a mean of 19.5 and a standard deviation of 4.7. (IEICE Transactions on Information & Systems, Jan. 2005.) Assuming the distribution of SNR values in the population is mound shaped and symmetric, give an interval that contains about 95% of all SNR values in the population. Would you expect to observe an SNR value of 30?
