What is bias? How should sampling be done to avoid bias?
484880
Bias in sampling is when you ask a certain group of people who all give similar answers or are not representative. for example, if u wanted to know if people thought strip clubs should be illegal but you only asked women's rights groups then ur results wouldnt be accurate. The best way to avoid it is to ask a certain amount of people of different genders, ages, religions or ethnicity maybe, in order to get a wide sample group. Is called stratisfied sampling.
924986
There are many applications of statistics to basic human needs.  One branch of statistics, sampling, can indicate the most cost effective way to check populations for disease or water supplies for safety.  Statistics are also used to detect differences between "control" and "treatment" groups in medical studies.  Statistics can also help evaluate economic aid programs, such as "micro-loans".
792033
The critical region of the sampling distribution of a statistics is also known as the alpha region.\n\nIt is the area, or areas, of the sampling distribution of a statistic that will lead to the rejection of the hypothesis tested when the hypothesis is true.\n\nI hope this is simple to understand.\n\nAll the best.
141056
Data capture should be about getting a "snapshot" of a data streamfrom one source at any discrete point, while data collection implies that you are collecting data from multiple sources for whatever purpose.  Seems to me that you could have a "collection of data that is nothing more than data captures"... (ok sorry)
1087310
In statistics, a sampling frame is the source from which a sample is drawn. It is a list of all those within a population who can be sampled, and may include individuals, households or institutions
156831
If you are talking about surveys similar to a public opinion survey then the size of the sample, the make up of the sample, and the wording of the question are several sources of error
855859
Cluster surveys are a type of cluster sampling, used to try and represent a large demographic by taking a small part of it. For example, in the mortality survey in Iraq that used Cluster Sampling, they defined various types of areas that should be sampled, then randomly picked a number of areas that met the various criteria (clusters). Then they randomly surveyed people living within that area.
1068975
Two possible ways: \n\nPreferably, conduct a vote;  a subjective measure of opinion given a statistically sound sample of your reference group. \n\nIf a statistically sound sample of the reference group is not available, use any subset available.. even if it is as low as one person (you)...
299943
Do you mean "biased", or "braised"
94693
Extrapolation is a process of logical induction.  You take a trend from observations, and assume a trend holds in order to predict the outcome of a hypothetical observation.
852941
How theoretical is it- can you type in a sample problem?
759777
They sample.  I wouldn't say steal because they pay for the usuage.
801986
You cannot, as the individual biases of the people affect the poll.\n\nWhat you are looking for is a poll that represents the people, not one that is unbiased.  For that, you need a large sample.  If you were doing a poll involving a town of 500, talk to at least 350 people.  If you were doing a state, that number would be much larger.\n\nA poll is to show the opinions of the people, not to be unbiased.  So you  need a large sample of the group you are targeting to get a good poll.
458174
Actually, statistics books are notorious for being written in such a way that no normal human can understand them. The trick, generally, is trying to find a way to relate the problems to something you're interested in. For example, if you like basketball: one possible sampling distribution would be the number of free throws individual players make over a season. You could take a sample of, say, 10 of the players and find the mean and standard deviation. You could compute a 95% confidence interval with that information, which would allow you to say that you're 95% confident that the average number of free throws made by NBA players in a season will be between this number and that number. You could find the probability that a given player would make at least a certain number of free throws in a season by finding the z-score and looking it up on the normal probability distribution table, etc. If you're really struggling with the terminology, I recommend visiting your math help center on campus (most of them have one), or contacting a tutor.
408697
For experimental data it is 100 * (average of the set - measured member of the set) / (average of the set).\n\nIf you are measuring something, how have you established an "Expected Value"? Why are you conducting an experiment/measurement if you already know what to expect?
248139
If you mean percentages as in survey statistics, None.\nEverything is relative to the way a question is asked, who is asked, and then how an individual percieves the question, and then whether or not the question is answered\nhonestly.All those variables make for extreme gaps in accuracy.
344093
Politics don't exist without bias.  You will need to gather all the information you can find and compile that information and make a decision about each issue based on what you've read and how you feel about particular issues.