Empirical Rule
The percentage of data located within 1 standard deviation of the mean.
What is 68%
The z-score corresponding to an SAT score of 630 when the mean score is 500 and the standard deviation is 100.
What is 1.3?
The probability of randomly selecting a member of a normally distributed population with a value less than the mean of the population.
What is 50%?
The z-score that corresponds to the cumulative area on the left of 0.3520.
What is -.38?
The greek symbol used to represent standard deviation.
What is sigma (lower case)?
The percentage of data located within 2 standard deviations of the mean.
What is 95%
The sign of the z-score of any data point that falls BELOW the mean.
What is a negative z score?
A group of men have heights that are normally distributed with a mean of 69.6 inches and a standard deviation of 3.0 inches. This is the probability of randomly selecting a man in this age group whose height is more than 72 inches.
What is .21?
My percentile if I scored a 620 on the critical reading portion on the SATs when the mean is 503 and the standard deviation is 117.
What is the 84th percentile?
The symbol for variance.
What is sigma squared?
The percent of data located within 3 standard deviations of the mean.
What is 99.7%?
The z score of a data point that is equal to the mean of the data.
What is 0?
A group of men have heights that are normally distributed with a mean of 69.6 inches and a standard deviation of 3.0 inches. This is the probability of randomly selecting a man in this age group whose height is between 66.6 and 72.6 inches.
What is .68?
The score on a test that represents the 50th percentile when the mean is 85 and the standard deviation is 5.
What is 85?
The z-score tells you how many of these a data point is from the mean.
What is standard deviation?
The percent of the data that lies outside of 1 standard deviation from the mean.
What is 32%?
The area under the standard normal curve that is to the left of a z-score of 1.
What is .84?
The weights of adult male beagles are normally distributed, with a mean of 25 pounds and a standard deviation of 3 pounds. This is the probability of randomly selected an adult male beagle whose weight is less than 22 pounds.
What is .16?
The z-score that separates the top 20% of the data.
What is .85?
List 3 different measures of spread.
What are range, variance, interquartile range, quartiles and standard deviation?
The percentage of data located between the mean and 1 standard deviation above the mean.
What is 34%?
The area under the standard normal curve between the z-scores of -2 and 1.
What is .815?
The weights of adult male beagles are normally distributed, with a mean of 25 pounds and a standard deviation of 3 pounds. This is the probability of randomly selected an adult male beagle whose weight is less than 22 pounds or greater than 28 pounds.
What is .32?
My percentile if I scored a 730 on the math portion on the SATs when the mean is 518 and the standard deviation is 115.
What is the 96th percentile?
Data for which the mode < Median < Mean.
What is right skewed data?