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I will assume the sample is random. In general, the larger the sample, the smaller the percentage error will be (the difference between percentages in the sample, and the percentages in the universe from whence the sample is taken). The percentage error tends to go down as the square root of the size of the sample.
Wiki User
∙ 6y ago
Wiki User
∙ 6y agoA small sample is sufficient provided that it is representative: that is, the sample units are chose randomly.
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Why calculate percent error after doing an experiment?
Because then you can assess how valid your results are =D
The same experiment was conducted 6 times. How many times should the results have been similar for them to be valid?
The answers are usually always valid. What may or may not be valid are your assumptions about the underlying model. Also, the number of times the results should be similar depends on the number of possible outcomes and the variability in the outcomes. For example, if you spin a fair spinner with 12 equal segments, then the probability of similar results is less than likely.
Why is it important to have a representative sample when doing surveys?
Because without representative sample, your results will not be valid.
What are the differences between validity and reliability?
validity is whether the results are valid so the data has no mistakes of as such in it whereas reliability is the dependability; when the results you have are accurate and are of enough quality.
How can you tell if the conclusion from an experiment is valid?
If you documented all your results, had a partner, had a witness, completed the experiment many times with the same results, and tested the experiment on the proper things then this would be good validation.
How might choosing a small sample size affect a scientific investigation?
Statistically the results will not be scientifically valid if the sample size is too small.
How can you ensure the accuracy of your results which conducting a scientific investigation?
Check if the results are valid
What is a valid investigation?
a valid investigation is an effective investigation i think. The results turn out to be what you had inferred.
To be a valid scientific experiment the results must be?
Repeatable
Sampling techniques can provide statistically reliable and valid survey results except?
Sampling techniques can provide statistically reliable and valid survey results except haphazard sampling.
What are 3 things that make experimental results valid?
booty
How do scientists make sure that their results are valid?
repeated trials
What makes a valid experiment?
To make an experiment valid you have to make sure that the experiments results answer the question that you first started from.
Give an example of how a test may be reliable but not valid?
A test may be reliable in that the methods, calculations, measurements and equipment are all correct. However, if one of the samples is flawed, the test would not be valid.
Does a greek citizen need a passport to enter the UK or is id card sufficient?
A valid passport is required
Psychological tests that yield relatively consistent results are said to be?
valid
Can a test be reliable and yet not valid?
A test may be reliable yet not valid, The results can end up being reliable, in other words certain to have yielded properly based on input. But the results may not be trustworthy.
