A bank’s loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 50. If an applicant is randomly selected, find the probability of a rating that is between 170 and 220. Suppose for 40 observations the variance is 50. If all the observations are increased by 20, the variance of these increased observations will be? These descriptive measures are from a sample of time measurements: x̅= 21.3 seconds; s = 1.7 seconds; and n = 400. At least what proportion of the data lies within 2 and 3/4 standard deviations from the arithmetic mean? In a study, subjects are randomly assigned to each of three groups: control, treatment A, and treatment B. After the experimental treatments were administered, the data on the three groups are compared. The appropriate statistical test to compare the means of the three groups would be the? The strength or degree of relationship between an independent variable X and a dependent variable Y, both measured in at least an interval level, is measured by the?
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
A bank’s loan officer rates applicants for credit. The ratings are
Suppose for 40 observations the variance is 50. If all the observations are increased by 20, the variance of these increased observations will be?
These descriptive measures are from a sample of time measurements: x̅= 21.3 seconds; s = 1.7 seconds; and n = 400. At least what proportion of the data lies within 2 and 3/4 standard deviations from the arithmetic mean?
In a study, subjects are randomly assigned to each of three groups: control, treatment A, and treatment B. After the experimental treatments were administered, the data on the three groups are compared. The appropriate statistical test to compare the means of the three groups would be the?
The strength or degree of relationship between an independent variable X and a dependent variable Y, both measured in at least an interval level, is measured by the?
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