In a study of reaction times to a specific stimulus, a psychologist recorded these data (in seconds). Find the variance and standard deviation. Round your answers to at least two decimal places. Class limits Frequency 2.1 - 2.7 13 2.8 - 3.4 11 3.5 - 4.1 9 4.2 - 4.8 7 4.9 - 5.5 4 5.6 - 6.2 2 Variance = what is the variance?
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.
In a study of reaction times to a specific stimulus, a psychologist recorded these data (in seconds). Find the variance and standard deviation. Round your answers to at least two decimal places.
| Class limits | Frequency |
|---|---|
|
2.1
2.7
|
13
|
|
2.8
3.4
|
11
|
|
3.5
4.1
|
9
|
|
4.2
4.8
|
7
|
|
4.9
5.5
|
4
|
|
5.6
6.2
|
2
|
| Variance |
=
|
what is the variance?
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