What is the missing value, x, in the GFDT?
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.
nn psychology students took a standardized test. The scores are summarized in the Grouped Frequency Distribution Table (GFDT) below.
Scores | Frequency |
140 - 144 | 15 |
145 - 149 | 15 |
150 - 154 | 16 |
155 - 159 | x |
160 - 164 | 15 |
165 - 169 | 39 |
The scores are also described in the cumulative table shown below.
Scores | Cumulative Frequency |
less than 145 | 15 |
less than 150 | 30 |
less than 155 | 46 |
less than 160 | 66 |
less than 165 | 81 |
less than 170 | n |
What is the missing value, x, in the GFDT? 26Incorrect
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