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What is the variance of these five scores 0 0 1 2 3?
Average = (0+0+1+2+3)/5 = 1.2 Variance = 1/N * SUM (x-E(x))2 = 1/5 * 6.8 = 1.36 Answer: Variance = 1.36
Assume that aset of test scores is normally distributed with a mean of 100 and a standard deviation of 20 use the 68-95-99?
68% of the scores are within 1 standard deviation of the mean -80, 120 95% of the scores are within 2 standard deviations of the mean -60, 140 99.7% of the scores are within 3 standard deviations of the mean -40, 180
How to find z scores?
If a random variable X has a Normal distribution with mean M and variance S2, then Z = (X - M)/S
How do you average scores if they are based on scores of 1 2 3 grade?
You have to add all of the three scores up. You will get a larger number than any of the three scores. You then divide your larger number by 3 and this will give you the average of the three scroes.
What was the average sat scores in 1975?
1500
What is the variance of of the scores 3 4 8 and 9?
sum of scores: 24 mean of scores : 24/4 = 6 squared deviations from the mean: 9, 4,4,9 sum of these: 26 sample variance: 26/4 = 6.5
1 The average of the squared deviation scores from a distribution mean?
Variance
What word means the average of the squared deviation scores from a distribution mean?
Variance
Is the variance of a group of scores the same as the squared standard deviation?
The standard deviation is defined as the square root of the variance, so the variance is the same as the squared standard deviation.
The standard deviation is the square root of the average squared deviation of scores from the?
mean
What is the variance of these four scores 6 9 3 6?
The variance is: 6.0
In statistics what is the variance of these four scores 0 1 1 2?
The variance is: 0.666666666667
What is the variance of these five scores 0 0 1 2 3?
Average = (0+0+1+2+3)/5 = 1.2 Variance = 1/N * SUM (x-E(x))2 = 1/5 * 6.8 = 1.36 Answer: Variance = 1.36
What is the range and standard deviation when the variance for a set of scores is 25?
5
What is the variance of these four scores - 0 1 1 2?
0.666666666667
What percentage of scores fall within -3 and plus 3 standard deviations around the mean in a normal distribution?
99.7% of scores fall within -3 and plus 3 standard deviations around the mean in a normal distribution.
What will happen if the difference between scores and the mean decreases?
The variance and the standard deviation will decrease.
