A nerve action potential should probably be considered as discontinuous as it moves very rapidly between the two states of polarization and depolarization.
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-Is the ECG/EKG a periodic signal
?
The ECG/EKG is periodic, although the R-R interval is not strictly constant.
, R-R .
-Is the equation for a straight line a polynomial
?
Yes, a straight line is a first-order polynomial.
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-Does a triangular waveform have finite harmonics at all multiples of the fundamental frequency
, ?
No, a triangular waveform has a fundamental and odd harmonics
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-What is the result of carrying out a Fourier transform on a rectangular impulse in time
?
You obtain a frequency spectrum of the form sin(t)/t if you carry out a Fourier transform on a rectangular impulse.
sin(t)/t .
-Is the variance of a data set equal to the square root of the standard deviation
?
No, the variance is equal to the square of the standard deviation
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-how are power and amplitude related
?
Power is proportional to the square of amplitude.
.
-What is an autocorrelation function and where is its maximum value
?
The autocorrelation function is produced by integrating the product of a signal and a time-shifted version of the signal. The maximum value is at zero time delay
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-Is an EMG signal periodic
?
An EMG signal is not periodic. It is the summation of many muscle action potentials which are
Asynchronous
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-What conclusion could you draw if the mean, mode and median values of a distribution were all the same
, ?
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The distribution must be symmetrical if the mean, mode and median are the same
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-What type of statistical distribution describes radioactive decay
?
A Poisson distribution is used to describe radioactive decay.
-If the number of false positives in a test for a diseases is 12 out of 48 results then what is the sensitivity of the test
12 48 , ?
- The sensitivity would be 1 − 12 / 48 = 0. 75
1 - 12/48 = 0,75
-If we carried out 10 different tests on a group of patients then would we change the chance of getting an abnormal result compared with just making one test
10 , , ?