The Sampling time means that at how much interval of time the continuous time signal is recorded
For example
If we have a simple square wave starting from 0 sec and ends at 5 sec with magnitude of 1 and let sampling time is Ts=0.5 second
Then the no. of samples obtained will be after each 0.5 second. So total number of samples will be 10.
Check it graphically and it will be more easy to understand.
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With a good sample, the sample mean gets closer to the population mean.
The variance decreases with a larger sample so that the sample mean is likely to be closer to the population mean.
The sample mean is an unbiased estimator of the population mean because the average of all the possible sample means of size n is equal to the population mean.
The population mean is the mean value of the entire population. Contrast this with sample mean, which is the mean value of a sample of the population.
Standard error of the sample mean is calculated dividing the the sample estimate of population standard deviation ("sample standard deviation") by the square root of sample size.