4. Given the following class intervals, compute for the following: Class Intervals frequency (f) 30 – 34 10 35 -39 14 40 – 44 26 45 – 49 35 50 – 54 23 55 – 59 19 60 – 64 15 65 – 69 6 70 - 74 4 Required: a. Coefficient of skewness b. Mean c. Median d. Standard deviation
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.
4. Given the following class intervals, compute for the following:
|
Class Intervals |
frequency (f) |
|
30 – 34 |
10 |
|
35 -39 |
14 |
|
40 – 44 |
26 |
|
45 – 49 |
35 |
|
50 – 54 |
23 |
|
55 – 59 |
19 |
|
60 – 64 |
15 |
|
65 – 69 |
6 |
|
70 - 74 |
4 |
Required:
a. Coefficient of skewness
b. Mean
c.
d. Standard deviation
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