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Ones that are near the population mean.
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∙ 10y ago
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Why is a sample often used instead of a census?
because its faster and then when you use a sample you can easily make accurate predictions about what would/will happen next
Does a calculator display the exact values of all irrational numbers?
No. An irrational number is one that does not repeat or finish, and a calculator cannot display millions of digits like an irrational number would have.
What is the sample size definition?
Sample size is the number of samples arawn from a population. If you drew 20 samples, your sample size would be 20.
How do you calculate mineral contents of the sample?
We would need to know what sample you are referring to in order to answer this question.
Is systematic sampling biased?
Often not, but it is important to check that there is no systematic pattern in the skip.To take an unlikely example, suppose you wanted to sample the values of 10% of houses on a street with 200 houses on it. A possible systematic sampling scheme would be to select a random house number to start with and then select every 20th house number (looping back when the number exceeds 200). If the first house number is odd then all houses in the sample are odd numbered and, therefore, on the same side of the street. If the street runs East-West, the sample could consist exclusively of South-facing gardens - attracting a price premium!
Given that Pi is infinite would not some long series of it have to repeat now and then?
There are no repeating strings of values in pi.
Why is a sample often used instead of a census?
because its faster and then when you use a sample you can easily make accurate predictions about what would/will happen next
When can an analog signal be reconstructed from its sample values?
An analog signal can be reconstructed from its sample values when the samples were taken often enough.Exactly how often is "often enough" depends on how accurately you want to reconstruct the original. The crucial question is "what is the highest frequency of interest in the original signal?". The usual rule of thumb is to sample at a minimum of twice that frequency.Beware. If you want to sample a piano playing a concert pitch A (440 Hz), your sample rate will depend on why you want to do it. If you just want to know that the piano played A rather than, say, middle C, a sample rate of 1KHz would do. However, if you want to be able to identify the instrument as a piano, a 1 KHz sample rate won't do at all. When the orchestra tunes up, and the oboe gives an A, it doesn't sound anything like a piano. The fundamental note is 440 Hz just like the piano, but every musical instrument produces multiples of the fundamental, called harmonics. It is the number of harmonics and their relative amplititudes which gives the instrument its distinctive sound. These are the "highest frequency of interest".
If repeating an experiment many times with different samples what values for the sample means would be possible?
The answer depends on the population and is described by the sampling distribution of the mean.
Are number values often called labels in Excel?
No. Labels are normally text. Numbers are usually referred to as values. Occasionally a number could be a label. Even then, they would often be formatted as text.
What is opportunity sampling?
An other word for opportunity sample is a convenience sample. Normally, you would sample subject through a process of randomisation. A convenience sample is made up by people that are easy to come by. Often these samples contain freshman students, because they can be obligated to participate in a certain number of studies.
If there is a small difference such as 5 600 and 5 602 between mean and median values what does this mean?
If the sample is small or not randomly chosen, it may not have much meaning at all. If the random sample is large, it would generally be inferred that the distribution is symmetrical. The skewness of the data can be calculated.
Does a calculator display the exact values of all irrational numbers?
No. An irrational number is one that does not repeat or finish, and a calculator cannot display millions of digits like an irrational number would have.
A sentence for emulate?
To emulate means to imitate or surpass either a person or an achievement. A sample sentence would be, "Children often emulate their elders".
What is the pH of propanol?
There are different types of propanol. And the pH values of propanol can fall anywhere within a very large range. It would probably be best to test your own sample of propanol and see what the result is.
When would random sampling not be the best approach to sample selection?
When would random sampling not be the best approach to sample selection
What You decide you want your sample to be representative of the population. Which sampling process would provide the most representative sample?
A simple random sample.
