number of students working less than 20 hours i
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.
their lifetime than are younger respondents.
3 The numbers of hours worked (per week) by 400 statistics students are shown below.
|
Number of Hours |
|
Frequency |
||
|
0 ≤ x < 10 |
|
|
20 |
|
|
10 ≤ x < 20 |
|
|
80 |
|
|
20 ≤ x < 30 |
|
|
200 |
|
|
30 ≤ x < 40 |
|
|
100 |
|
The number of students working less than 20 hours is _____.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
