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Rifles, Reloading, Optics, Equipment
Reloading
5 or 3 shot group when determining ES/SD???
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<blockquote data-quote="rscott5028" data-source="post: 625272" data-attributes="member: 24624"><p>Plot your 300 samples and it should approximate a normal distribution a/k/a bell curve. </p><p> </p><p>Calculate the mean and standard deviation of all 300 and you should have roughly 95% confidence that any future shots fired will fall within 2 standard deviations of the mean. </p><p> </p><p>You could then pull 30 random cold bore samples and calculate the mean and standard deviation followed by a two tailed T test to see if there's a statistically significant difference in MV for your cold bore shots vs all shots fired. </p><p> </p><p>Well, that's a very rough example. But, most of us unintentionally tend to focus on our smallest group or tightest ES regardless of the facts. </p><p> </p><p>Figures don't lie. But, liars figure. </p><p> </p><p>The most important thing is to measure your own performance and keep in mind that when the numbers continue to shrink, you're doing something right and when they grow, you're going in the wrong direction. </p><p> </p><p>-- richard</p></blockquote><p></p>
[QUOTE="rscott5028, post: 625272, member: 24624"] Plot your 300 samples and it should approximate a normal distribution a/k/a bell curve. Calculate the mean and standard deviation of all 300 and you should have roughly 95% confidence that any future shots fired will fall within 2 standard deviations of the mean. You could then pull 30 random cold bore samples and calculate the mean and standard deviation followed by a two tailed T test to see if there's a statistically significant difference in MV for your cold bore shots vs all shots fired. Well, that's a very rough example. But, most of us unintentionally tend to focus on our smallest group or tightest ES regardless of the facts. Figures don't lie. But, liars figure. The most important thing is to measure your own performance and keep in mind that when the numbers continue to shrink, you're doing something right and when they grow, you're going in the wrong direction. -- richard [/QUOTE]
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Reloading
5 or 3 shot group when determining ES/SD???
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