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? 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.
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?
What is the missing value, n, in the cumulative table?
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