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standard error
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∙ 13y ago
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How do you calculate standard deviation with the help of z-score?
A z-score cannot help calculate standard deviation. In fact the very point of z-scores is to remove any contribution from the mean or standard deviation.
What is a statistic inflection point?
There are two points of infection (the points where the curvature changes its direction) which lie at a distance of one standard deviation above mean and one standard deviation below mean.
What does it mean to find a data point within one standard deviation of the mean?
The data point is close to the expected value.
What is the reference point of a standard deviation?
The mean.The mean.The mean.The mean.
Using mean of 6.375 and Standard deviation of 1.47 plot values on normal distribution?
Your middle point or line for the plot (mean) would be 6.375. Then you would add/subtract 1.47 from your mean. For example, one standard deviation would equal 6.375 + 1.47 and one standard deviation from the left would be 6.375 - 1.47
How do you apply standard deviation to normal curve?
The distance between the middle and the inflection point is the standard deviation.
How do you calculate standard deviation with the help of z-score?
A z-score cannot help calculate standard deviation. In fact the very point of z-scores is to remove any contribution from the mean or standard deviation.
How is standard deviation useful?
It's used in determining how far from the standard (average) a certain item or data point happen to be. (Ie, one standard deviation; two standard deviations, etc.)
What is the impact of the new point on the standard deviation?
The answer depends on the value of the new point. If the new value is near the mean then the new standard deviation (SD) will be smaller, if it is far away, the new SD will be larger.
What is a statistic inflection point?
There are two points of infection (the points where the curvature changes its direction) which lie at a distance of one standard deviation above mean and one standard deviation below mean.
Can a standard deviation be less than 1?
Yes. Standard deviation depends entirely upon the distribution; it is a measure of how spread out it is (ie how far from the mean "on average" the data is): the larger it is the more spread out it is, the smaller the less spread out. If every data point was the mean, the standard deviation would be zero!
What does it mean to find a data point within one standard deviation of the mean?
The data point is close to the expected value.
What is the reference point of a standard deviation?
The mean.The mean.The mean.The mean.
What is the best estimator of population mean?
The best point estimator of the population mean would be the sample mean.
Using mean of 6.375 and Standard deviation of 1.47 plot values on normal distribution?
Your middle point or line for the plot (mean) would be 6.375. Then you would add/subtract 1.47 from your mean. For example, one standard deviation would equal 6.375 + 1.47 and one standard deviation from the left would be 6.375 - 1.47
Can standard deviation equal zero?
Standard deviation can only be zero if all the data points in your set are equal. If all data points are equal, there is no deviation. For example, if all the participants in a survey coincidentally were all 30 years old, then the value of age would be 30 with no deviation. Thus, there would also be no standard deviation.A data set of one point (small sample) will always have a standard deviation of zero, because the one value doesn't deviate from itself at all.!
Why can a t statistic not be computed with a single score?
In essence, it's because a single data point provides no information about the dispersion of the population from which it was drawn. If you look at the definition of the t statistic you will notice that there is an estimator of of the population standard deviation in its denominator (in other words, the population's dispersion). Without at least two data points this estimator cannot be calculated. Think about it another way. If you have many observations you have a good idea how 'closely' they are distributed. The fewer you have the less information is available.
