In a survey, 20 people were asked how many magazines they had purchased during the previous year. The results are shown below. a)- Construct a histogram to represent the data. Use 4 classes with a class width of 10, and begin with a lower class limit of -0.5. b) What is Median? What is the mode? c) Is the histogram skewed? to what direction? results are shown below. 6 15 3 36 25 18 12 18 5 30 24 7 0 22 33 24 19 4 12 9
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 survey, 20 people were asked how many magazines they had purchased during the previous year. The results are shown below.
a)- Construct a histogram to represent the data. Use 4 classes with a class width of 10, and begin with a lower
class limit of -0.5.
b) What is Median? What is the
c) Is the histogram skewed? to what direction?
results are shown below.
6 15 3 36 25 18 12 18 5 30 24 7 0 22 33 24 19 4 12 9
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