Use the frequency column from the table below to compute a weighted average for that data by treating the midpoint of each group as the individual means (Midpoints: 4.5, 14.5, 24.5, 34.5, 44.5). Classes Frequency 0-9 10 10-19 15 20-29 22 30-39 17 40-49 6
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.
Use the frequency column from the table below to compute a weighted average for that data by treating the midpoint of each group as the individual means (Midpoints: 4.5, 14.5, 24.5, 34.5, 44.5).
|
Classes |
Frequency |
|
0-9 |
10 |
|
10-19 |
15 |
|
20-29 |
22 |
|
30-39 |
17 |
|
40-49 |
6 |
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