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How do you find normal distribution of z-scores?
z-scores are distributed according to the standard normal distribution. That is, with the parameters: mean 0 and variance 1.
What word means the average of the squared deviation scores from a distribution mean?
Variance
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.
A normal distribution has a mean of µ = 50 with σ = 10. What proportion of the scores in this distribution are greater than X = 65?
Scores on the SAT form a normal distribution with a mean of µ = 500 with σ = 100. What is the probability that a randomly selected college applicant will have a score greater than 640?
How would you characterize the distribution of scores in a normal distribution?
They are said to be Normally distributed.
When the mean of a distribution of scores of measures is higher than the median the distribution would be?
The distribution is skewed to the right.
How do you find normal distribution of z-scores?
z-scores are distributed according to the standard normal distribution. That is, with the parameters: mean 0 and variance 1.
1 The average of the squared deviation scores from a distribution mean?
Variance
What statistic is the average amount by which the scores in a distribution vary from the mean?
Standard deviation
What word means the average of the squared deviation scores from a distribution mean?
Variance
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 is the mean and standard deviation of a distribution of T-scores?
The answer depends on the degrees of freedom (df). If the df > 1 then the mean is 0, and the standard deviation, for df > 2, is sqrt[df/(df - 2)].
A normal distribution has a mean of µ = 50 with σ = 10. What proportion of the scores in this distribution are greater than X = 65?
Scores on the SAT form a normal distribution with a mean of µ = 500 with σ = 100. What is the probability that a randomly selected college applicant will have a score greater than 640?
A lopsided distribution of scores in which the mean is much larger than both the mode and median is said to be?
skewed.
The distribution of intelligence test scores in the general population forms a bell-shaped pattern This pattern is called?
The pattern is called a normal distribution, or a bell curve. It is characterized by symmetrical data points around the mean, with most scores clustering around the average and progressively fewer scores as you move away from the mean in either direction.
How do you find the scores at the 60th percentile in a set of 200 scores?
You can't do this without knowing the distribution of scores.
What happens to mean when any score in a distribution is changed?
If there are n scores and one score is changed by x then the mean changes by x/n.
