n psychology students took a standardized test. The scores are summarized in the Grouped Frequency Distribution Table (GFDT) below. Scores Frequency 200 209 11 210 219 15 220 229 17 230 239 240 249 19 250 259 38 The scores are also described in the cumulative table shown below. Cumulative Scores Frequency less than 210 11 less than 220 26 less than 230 43 less than 240 63 less than 250 82 less than 260 What is the missing value, x, in the GFDT? What is the missing value, n, in the cumulative table?
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.
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