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What z-score value separates the highest 40 percent of the scores from the rest of the distribution?
0.2533
What is a negative frequency distribution?
If most the population has many high scores, the distribution is negatively skewed. If most have many low scores, it is positively skewed
1 The average of the squared deviation scores from a distribution mean?
Variance
What is one advantage of transforming X values into z-scores?
True or False, One major advantage of transforming X values into z-scores is that the z-scores always form a normal distribution
What percentage of scores fall between 0 and -2 in a normal distribution?
2
What proportion of a normal distribution corresponds to z-scores greater than plus 1.04?
To find the proportion of a normal distribution corresponding to z-scores greater than +1.04, you can use the standard normal distribution table or a calculator. The area to the left of z = 1.04 is approximately 0.8508. Therefore, the proportion of the distribution that corresponds to z-scores greater than +1.04 is 1 - 0.8508, which is approximately 0.1492, or 14.92%.
For a normal distribution what z-score value separates the lowest 10 percent of the scores from the rest of the distribution?
-1.28
What proportion of a normal distribution corresponds to z scores greater than 1.04?
In a normal distribution, approximately 76.4% of the data falls below a z score of 1.04. Therefore, the proportion of the distribution that corresponds to z scores greater than 1.04 is about 23.6%. This can be found using standard normal distribution tables or calculators.
What percent of the scores in a normal distribution will fall within one standard deviation?
It is 68.3%
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?
In a standard normal distribution about percent of the scores fall above a z-score of 3.00?
0.13
What z-score value separates the highest 40 percent of the scores from the rest of the distribution?
0.2533
The mean of a distribution of scores is the?
The mean of a distribution of scores is the average.
What statements cannot be True for distribution of scores?
In a distribution of scores, statements that cannot be true include: a mean that is significantly higher than the maximum score, as this is mathematically impossible; a standard deviation of zero in a set of varied scores, which would imply no variability; and a negative score in a context where all scores are non-negative, such as test scores. Additionally, a distribution cannot have a mode that is greater than the maximum value present in the data set.
If a sample of n 15 scores has been organized in a grouped frequency distribution table it is possible to obtain a list of all 15 scores from the table?
true
What is the range of possible percent scores a student could can earn on a test?
50% to 100%.
In a standard normal distribution about percent of the scores fall above a z score of 300?
A Z score of 300 is an extremely large number as the z scores very rarely fall above 4 or below -4. About 0 percent of the scores fall above a z score of 300.
