The actual term is "effective range". That is the range where a trained shooter can consistently hit the target. For example- a 9mm pistol has an effective range of about 50 meters. However, it can shoot a bullet about 960 meters. But at that range, you will not consistently hit anything- except the earth.
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It will be accurate at any range- however, I think you mean at what range will the point of aim and point of impact be the same. It will vary depending on the cartridge you use, barrel length, and scope height- BUT- assuming an average 30-06 load, with a scoped rifle, a 35 yard zero will have point of impact meeting point of aim at ABOUT 200 yards.
It gives an indication of the spread in the values: are they all very close to the mean value or scattered across a wide range of values? That is important in determining how accurate your point estimate of the mean is.
right correct accurate
Accuracy depends on what you are trying to measure.As a measure of central tendency, the range is totally useless because it is not a measure of central tendency. As a measure of spread (dispersion), it is the most accurate because it is the only one that measures spread: the other threee are totally useless.With nominal data, the median and mean are not defined and so cannot be accurate.And so on.Accuracy depends on what you are trying to measure.As a measure of central tendency, the range is totally useless because it is not a measure of central tendency. As a measure of spread (dispersion), it is the most accurate because it is the only one that measures spread: the other threee are totally useless.With nominal data, the median and mean are not defined and so cannot be accurate.And so on.Accuracy depends on what you are trying to measure.As a measure of central tendency, the range is totally useless because it is not a measure of central tendency. As a measure of spread (dispersion), it is the most accurate because it is the only one that measures spread: the other threee are totally useless.With nominal data, the median and mean are not defined and so cannot be accurate.And so on.Accuracy depends on what you are trying to measure.As a measure of central tendency, the range is totally useless because it is not a measure of central tendency. As a measure of spread (dispersion), it is the most accurate because it is the only one that measures spread: the other threee are totally useless.With nominal data, the median and mean are not defined and so cannot be accurate.And so on.
interquartile range or mean absolute deviation.